Docs: Improve date-and-time-handling guide to make it clear which date/time formats are supported out-of-the-box

[sequba]

Context

Improve date-and-time-handling guide to make it clear which date/time formats are supported out-of-the-box

Types of changes

• Breaking change (a fix or a feature because of which an existing functionality doesn't work as expected anymore)
• New feature or improvement (a non-breaking change that adds functionality)
• Bug fix (a non-breaking change that fixes an issue)
• Additional language file, or a change to an existing language file (translations)
• Change to the documentation

Related issues:

1. Fixes Make it more clear what date/time formats are supported out of the box #1133

Checklist:

• I have reviewed the guidelines about Contributing to HyperFormula and I confirm that my code follows the code style of this project.
• I have signed the Contributor License Agreement.
• My change is compliant with the OpenDocument standard.
• My change is compatible with Microsoft Excel.
• My change is compatible with Google Sheets.
• I described my changes in the CHANGELOG.md file.
• My changes require a documentation update.
• My changes require a migration guide.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.22%. Comparing base (5eba6fb) to head (e729a80).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1555   +/-   ##
========================================
  Coverage    97.22%   97.22%           
========================================
  Files          169      169           
  Lines        14526    14526           
  Branches      3171     3171           
========================================
  Hits         14123    14123           
  Misses         396      396           
  Partials         7        7           

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[github-actions]

Performance comparison of head (e729a80) vs base (5eba6fb)

                                     testName |   base |   head | change
------------------------------------------------------------------------
                                      Sheet A | 504.53 | 510.25 | +1.13%
                                      Sheet B | 163.42 | 171.41 | +4.89%
                                      Sheet T | 146.66 | 150.56 | +2.66%
                                Column ranges | 501.97 | 507.66 | +1.13%
Sheet A:  change value, add/remove row/column |  15.33 |  15.23 | -0.65%
 Sheet B: change value, add/remove row/column | 138.42 | 139.35 | +0.67%
                   Column ranges - add column | 145.68 | 145.37 | -0.21%
                Column ranges - without batch | 465.03 | 461.17 | -0.83%
                        Column ranges - batch | 116.72 | 118.92 | +1.88%