docs: client page ssr clarification

[ndom91]

Reasoning 💡

Small changes to clarify the documentation regarding protecting all pages in _app.jsx.

Replaces #2349

Checklist 🧢

• Documentation
• Tests
• Ready to be merged

Affected issues 🎟

Fixes #2187

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[codecov-commenter]

Codecov Report

Merging #2355 (d1694cc) into next (111d5fc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             next    #2355   +/-   ##
=======================================
  Coverage   10.87%   10.87%           
=======================================
  Files          82       82           
  Lines        1398     1398           
  Branches      389      389           
=======================================
  Hits          152      152           
  Misses       1028     1028           
  Partials      218      218           

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