Docs: add section about handling Unicode characters in a sheet name when writing a cell reference

[sequba]

Context

How did you test your changes?

local docs build

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 Docs: Describe usage of non-ASCII characters in the sheet names #1313

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 (f7e11eb) to head (9dfc2a9).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1525   +/-   ##
========================================
  Coverage    97.22%   97.22%           
========================================
  Files          169      169           
  Lines        14523    14523           
  Branches      3169     3169           
========================================
  Hits         14120    14120           
  Misses         396      396           
  Partials         7        7           

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[github-actions]

Performance comparison of head (9dfc2a9) vs base (f7e11eb)

                                     testName |   base |   head | change
------------------------------------------------------------------------
                                      Sheet A | 506.88 |  505.1 | -0.35%
                                      Sheet B | 164.62 | 162.18 | -1.48%
                                      Sheet T | 143.85 | 143.02 | -0.58%
                                Column ranges | 506.91 | 507.52 | +0.12%
Sheet A:  change value, add/remove row/column |  13.53 |  13.42 | -0.81%
 Sheet B: change value, add/remove row/column | 121.77 | 121.74 | -0.02%
                   Column ranges - add column | 146.52 | 149.23 | +1.85%
                Column ranges - without batch | 442.89 | 434.43 | -1.91%
                        Column ranges - batch |    111 | 108.44 | -2.31%