Update client-side-vs-server-side.md

[gbsimon87]

Change "these endpoints offers" to "these endpoints offer"

Amplitude Developer Docs PR

Description

Change "these endpoints offers" to "these endpoints offer"

Deadline

When do these changes need to be live on the site?

Change type

• Doc bug fix. Fixes #[insert issue number]. Amplitude contributors include Jira issue number.
• [ x ] Doc update.
• New documentation.
• Non-documentation related fix or update.

PR checklist:

• [x ] My documentation follows the style guidelines of this project.
• [ x] I previewed my documentation on a local server using mkdocs serve.
• [ x] Running mkdocs serve didn't generate any failures.
• [ x] I have performed a self-review of my own documentation.

@amplitude-dev-docs

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