Update wording and fix a few typos

[bschoening]

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The Cassandra Jira

[Copilot]

Pull request overview

This pull request updates documentation wording and corrects typos across two documentation files in the Cassandra project.

• Fixes spelling errors in the documentation
• Improves clarity and readability of technical descriptions
• Updates punctuation for better grammar

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
doc/modules/cassandra/pages/managing/tools/cqlsh.adoc	Corrects "evalution" to "evaluation" and adds comma after "By default"
doc/modules/cassandra/pages/architecture/overview.adoc	Refines wording for Cassandra's history and design objectives, improves partition key definition clarity

Note: While reviewing the changes, I found one additional typo ("scaleability" should be "scalability") in the newly added content on line 11 of the architecture overview file.

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