Fix documentation grammar, types, signatures, and add missing docs

[oschwald]

Summary

• Fix grammar and typos across README.md, README.dev.md, and doc/libmaxminddb.md (subject-verb agreement, missing prepositions, duplicated articles, possessive "its")
• Fix incorrect type reference (MMDB_result_s → MMDB_entry_s) and field reference (data_type → type)
• Update function signatures in docs to match const MMDB_s *const mmdb qualifiers from maxminddb.h for MMDB_lookup_string, MMDB_lookup_sockaddr, MMDB_read_node, and MMDB_get_metadata_as_entry_data_list
• Update MMDB_read_node bounds check description to match >= implementation
• Clarify MMDB_get_entry_data_list start parameter (relates to Improvement needed in libmaxminddb docs #145)
• Document how to work with maps and arrays using MMDB_get_value() and MMDB_get_entry_data_list() (relates to Iterating over map or array returned with MMDB_get_value() #255)

Test plan

• make check passes (all 28 tests)
• Man page generation with lowdown succeeds
• Rendered man pages display correctly

🤖 Generated with Claude Code

[gemini-code-assist]

Summary of Changes

Hello @oschwald, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the clarity, accuracy, and completeness of the project's documentation. It addresses numerous grammatical inconsistencies and typos, corrects outdated or incorrect API references, and ensures that function signatures in the documentation precisely match their C header definitions. Furthermore, it provides crucial new guidance on handling complex data structures like maps and arrays, making the library easier to understand and use for developers.

Highlights

• Documentation Grammar and Typos: Corrected various grammatical errors and typos across README.md, README.dev.md, and doc/libmaxminddb.md to improve readability and accuracy.
• API Reference Corrections: Fixed an incorrect type reference from MMDB_result_s to MMDB_entry_s and a field reference from data_type to type within the documentation.
• Function Signature Alignment: Updated function signatures in doc/libmaxminddb.md to consistently use const MMDB_s *const mmdb qualifiers for MMDB_lookup_string, MMDB_lookup_sockaddr, MMDB_read_node, and MMDB_get_metadata_as_entry_data_list, matching the maxminddb.h header.
• MMDB_read_node Bounds Check Clarification: Clarified the description of the MMDB_read_node bounds check to accurately reflect the >= implementation.
• MMDB_get_entry_data_list Parameter Clarification: Added clarification for the start parameter of MMDB_get_entry_data_list to explain its expected value source.
• Map and Array Documentation: Provided new documentation on how to effectively work with maps and arrays using MMDB_get_value() and MMDB_get_entry_data_list().

Changelog

• README.dev.md
  • Corrected a typo in the release instructions from 'include specify' to 'specify'.
• README.md
  • Fixed subject-verb agreement for compiler support from 'supports' to 'support'.
  • Corrected verb agreement for installation sources from 'are possible' to 'is possible'.
• doc/libmaxminddb.md
  • Updated MMDB_lookup_string signature to include const qualifier for mmdb parameter.
  • Updated MMDB_lookup_sockaddr signature to include const qualifier for mmdb parameter.
  • Updated MMDB_get_metadata_as_entry_data_list signature to include const qualifier for mmdb parameter.
  • Updated MMDB_read_node signature to include const qualifier for mmdb parameter.
  • Corrected grammar in the library description, adding 'with' after 'working'.
  • Changed section heading from MMDB_result_s to MMDB_entry_s.
  • Added documentation for accessing map and array elements using MMDB_get_value() and MMDB_get_entry_data_list().
  • Corrected field reference from data_type to type in MMDB_get_value() description.
  • Corrected possessive 'it's' to 'its' in error message description.
  • Clarified the usage of MMDB_get_entry_data_list() for complex structures.
  • Added a description for the start parameter of MMDB_get_entry_data_list().
  • Updated the MMDB_read_node bounds check description from 'greater than' to 'greater than or equal to'.

Activity

• The author confirmed that make check passes all 28 tests.
• The author verified that man page generation with lowdown succeeds.
• The author confirmed that rendered man pages display correctly.
• The pull request was generated with Claude Code.

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[gemini-code-assist]

Code Review

This pull request focuses on improving the documentation by fixing grammar, typos, and incorrect type/field references, as well as updating function signatures to match the header files. The changes are well-executed and enhance the clarity and accuracy of the documentation. I've found one minor inaccuracy in the description of a function parameter and have provided a suggestion to correct it.

[gemini-code-assist]

The description of the start parameter is slightly inaccurate. The function signature int MMDB_get_entry_data_list(MMDB_entry_s *start, ...) shows that start is a pointer to an MMDB_entry_s struct, not the struct value itself. The documentation should reflect this to avoid confusion.

Suggested change

	The `start` parameter is an `MMDB_entry_s` value. In most cases this will come
	from the `entry` field of the `MMDB_lookup_result_s` value returned by
	`MMDB_lookup_string()` or `MMDB_lookup_sockaddr()`.
	The `start` parameter is a pointer to an `MMDB_entry_s` struct. In most cases this will be a pointer to the `entry` field of the `MMDB_lookup_result_s` value returned by `MMDB_lookup_string()` or `MMDB_lookup_sockaddr()`.