chore: fix comment on outbound bridge router contract

[garythung]

L2GatewayRouter serves outbound bridging. Comment had the direction backwards.

[cla-bot]

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[codecov]

Codecov Report

Merging #2511 (df27288) into master (86a7545) will decrease coverage by 4.72%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2511      +/-   ##
==========================================
- Coverage   47.01%   42.29%   -4.73%     
==========================================
  Files         145      201      +56     
  Lines       15872    23390    +7518     
  Branches      528      528              
==========================================
+ Hits         7463     9892    +2429     
- Misses       8267    13093    +4826     
- Partials      142      405     +263     

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