Pre-release doc fixes

[philippjfr]

Final attempt at fixing cross-references and some ambiguous type warnings.

Fixes #7284

[philippjfr]

May be related to executablebooks/MyST-Parser#749

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 82.20%. Comparing base (919d996) to head (927d55e).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
panel/reactive.py	50.00%	1 Missing ⚠️
panel/template/base.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #7283       +/-   ##
===========================================
+ Coverage   41.56%   82.20%   +40.64%     
===========================================
  Files         325      337       +12     
  Lines       48064    50380     +2316     
===========================================
+ Hits        19976    41413    +21437     
+ Misses      28088     8967    -19121     

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