Final cleanup of warnings (TOC and Intro)

Author: daksh1403

docs/source/conf.py

@@ -83,8 +83,6 @@
     "build",
     "Thumbs.db",
     ".DS_Store",
-    "error_code_list.rst",
-    "error_code_list2.rst",
 ]
 
 # The reST default role (used for this markup: `text`) to use for all

docs/source/error_codes.rst

@@ -11,9 +11,7 @@ after each error message. Error codes serve two purposes:
    potentially more serious errors.
 
 2. The error code can be used to find documentation about the error.
-   The next two topics (:ref:`error-code-list` and
-   :ref:`error-codes-optional`) document the various error codes
-   mypy can report.
+   The sections below document the various error codes mypy can report.
 
 Most error codes are shared between multiple related error messages.
 Error codes may change in future mypy releases.