refs: issue-27728, Improve java sdk docs

[Laksh47]

Fixes #27728

Description:

• Keep documentation consistent across SDKs
• Java SDK docs doesn't mention detail about inequality queries for withNumQuerySplits function
• Python SDK docs mention the same here

javadoc:

pydoc:

context: faced this exception while running a dataflow job that utilizes this function

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[bvolpato]

LGTM. Thank you Laksh!

[Abacn]

Thank you!