CASSANDRA-21218: Fix typos in documentation

[Shanzita]

Fix typos in documentation

Fixed the following typos in the documentation:

• repair.adoc (line 3): "it's nodes" → "its nodes"
• repair.adoc (line 107): "Similiar" → "Similar"
• ddl.adoc (line 36): "If is is not" → "If it is not"
• data-modeling_refining.adoc (line 26): "number of of values" → "number of values"
• accord-architecture.adoc (line 248): "by the the whole cluster" → "by the whole cluster"

patch by Shanzitaa; reviewed by TBD for CASSANDRA-21218

[Copilot]

Pull request overview

This PR addresses minor typos in the Cassandra documentation (AsciiDoc), improving readability and correctness without changing any runtime behavior.

Changes:

• Fixes incorrect possessive usage (“it’s” → “its”) and duplicated words (“of of”, “the the”).
• Corrects a spelling error (“Similiar” → “Similar”).
• Fixes a grammatical typo (“If is is not” → “If it is not”).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
doc/modules/cassandra/pages/managing/operating/repair.adoc	Corrects “it’s” → “its” and “Similiar” → “Similar” in repair documentation.
doc/modules/cassandra/pages/developing/data-modeling/data-modeling_refining.adoc	Removes duplicated word “of” in partition size explanation.
doc/modules/cassandra/pages/developing/cql/ddl.adoc	Fixes “If is is not” → “If it is not” in naming/qualification explanation.
doc/modules/cassandra/pages/architecture/accord-architecture.adoc	Removes duplicated “the” in SyncPoints description.

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[bschoening]

+1