chore: fix some typos in comments

[liuyueyangxmu]

High Level Overview of Change

fix some typos in comments

Context of Change

Type of Change

• Documentation update

API Impact

• Public API: New feature (new methods and/or new fields)
• Public API: Breaking change (in general, breaking changes should only impact the next api_version)
• libxrpl change (any change that may affect libxrpl or dependents of libxrpl)
• Peer protocol change (must be backward compatible or bump the peer protocol version)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.6%. Comparing base (8564702) to head (1795879).

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #6082   +/-   ##
=======================================
  Coverage     78.6%   78.6%           
=======================================
  Files          818     818           
  Lines        68938   68938           
  Branches      8241    8237    -4     
=======================================
  Hits         54166   54166           
  Misses       14772   14772           

Files with missing lines	Coverage Δ
src/xrpld/rpc/detail/TransactionSign.cpp	87.5% <ø> (ø)

... and 5 files with indirect coverage changes

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