Update Install.md rsp install part

[Atralupus]

Related to https://github.com/coder/code-server/issues/5174 Add issue to rsp install part

[codecov[bot]]

Codecov Report

Merging #5294 (aaa49d3) into main (de04217) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #5294   +/-   ##
=======================================
  Coverage   72.42%   72.42%           
=======================================
  Files          30       30           
  Lines        1672     1672           
  Branches      366      366           
=======================================
  Hits         1211     1211           
  Misses        398      398           
  Partials       63       63           

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