Backport PR #917 on branch 1.x (Fix c.GatewayClient.url snippet syntax)

[meeseeksmachine]

Backport PR #917: Fix c.GatewayClient.url snippet syntax

[codecov-commenter]

Codecov Report

Merging #918 (00b7dad) into 1.x (98db236) will increase coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              1.x     #918      +/-   ##
==========================================
+ Coverage   71.64%   71.72%   +0.07%     
==========================================
  Files          62       62              
  Lines        7686     7686              
  Branches     1272     1275       +3     
==========================================
+ Hits         5507     5513       +6     
+ Misses       1785     1782       -3     
+ Partials      394      391       -3     

Impacted Files	Coverage Δ
jupyter_server/serverapp.py	65.42% <0.00%> (+0.18%)	⬆️
jupyter_server/services/contents/filemanager.py	72.20% <0.00%> (+0.79%)	⬆️

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