Missing docs on window function features

[jseldess]

Jesse Seldess (jseldess) commented:

These features were added back in 2.1:

PR: cockroachdb/cockroach#28244

From release notes:

CockroachDB now supports the GROUPS mode for specification of window function frames. [#28244][#28244] {% comment %}doc{% endcomment %}

PR: cockroachdb/cockroach#26666

From release notes:

CockroachDB now supports custom frame specification for window functions using ROWS (fully-supported) and RANGE modes. For RANGE, PRECEDING and FOLLOWING are not supported. [#26666][#26666] {% comment %}doc{% endcomment %}

PR: cockroachdb/cockroach#27022

From release notes:

CockroachDB now fully supports the RANGE mode for specification of window function frames. [#27022][#27022] {% comment %}doc{% endcomment %}

Jira Issue: DOC-1156

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