Update simple_form.en.yml

[brendanjones]

Adds one sentence to the language filter setting. Aim is to make people less likely to think this setting missing boosts and hashtags in Home is a bug, like reported in #20241 and #20937.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.30%. Comparing base (86500e3) to head (2f196a9).
Report is 812 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #29349      +/-   ##
==========================================
+ Coverage   85.01%   85.30%   +0.29%     
==========================================
  Files        1059     1089      +30     
  Lines       28277    28767     +490     
  Branches     4538     4580      +42     
==========================================
+ Hits        24040    24541     +501     
+ Misses       3074     3054      -20     
- Partials     1163     1172       +9     

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