[Backport 2.x] Fix Documentation for various languages in Discover

[opensearch-trigger-bot]

Backport e5b7067 from #8636.

[github-actions]

❌ Invalid Changelog Heading

The '## Changelog' heading in your PR description is either missing or malformed. Please make sure that your PR description includes a '## Changelog' heading with proper spelling, capitalization, spacing, and Markdown syntax.

[virajsanghvi]

approving assuming ci passes

[codecov]

Codecov Report

Attention: Patch coverage is 40.90909% with 13 lines in your changes missing coverage. Please review.

Project coverage is 60.95%. Comparing base (d47ecc0) to head (ab3d643).
Report is 3 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...string/language_service/lib/language_reference.tsx	16.66%	5 Missing ⚠️
...ng/language_service/lib/dql_language_reference.tsx	42.85%	4 Missing ⚠️
...language_service/lib/lucene_language_reference.tsx	42.85%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              2.x    #8657      +/-   ##
==========================================
- Coverage   60.96%   60.95%   -0.01%     
==========================================
  Files        3784     3786       +2     
  Lines       90183    90189       +6     
  Branches    14124    14124              
==========================================
+ Hits        54978    54979       +1     
- Misses      31741    31746       +5     
  Partials     3464     3464              

Flag	Coverage Δ
Linux_1	29.13% <22.72%> (+<0.01%)	⬆️
Linux_2	56.53% <ø> (ø)
Linux_3	37.74% <40.90%> (-0.01%)	⬇️
Linux_4	30.03% <22.72%> (+<0.01%)	⬆️
Windows_1	29.15% <22.72%> (+<0.01%)	⬆️
Windows_2	56.48% <ø> (ø)
Windows_3	37.74% <40.90%> (-0.01%)	⬇️
Windows_4	30.03% <22.72%> (+<0.01%)	⬆️

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