fix(ctb): Update Portal comments

[maurelian]

Description

Two corrections made here to the Portal comments:

1. pause() only affects withdrawals, not deposits
2. the _gasLimit argument in depositTransaction() is not a minimum. I suspect that goes back to some earlier deposit fee design ideas.

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Latest commit: eb58b74

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[codecov]

Codecov Report

Merging #6146 (eb58b74) into develop (0119b6c) will increase coverage by 0.63%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6146      +/-   ##
===========================================
+ Coverage    45.28%   45.91%   +0.63%     
===========================================
  Files          381      410      +29     
  Lines        27290    27471     +181     
  Branches       478      533      +55     
===========================================
+ Hits         12357    12613     +256     
+ Misses       13927    13806     -121     
- Partials      1006     1052      +46     

Flag	Coverage Δ
bedrock-go-tests	44.97% <ø> (+<0.01%)	⬆️
cannon-go-tests	61.71% <ø> (ø)
common-ts-tests	?
contracts-bedrock-tests	58.16% <ø> (?)
core-utils-tests	?
fault-detector-tests	26.95% <ø> (ø)
sdk-tests	39.83% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../contracts-bedrock/contracts/L1/OptimismPortal.sol	87.75% <ø> (ø)

... and 87 files with indirect coverage changes