Clarify documentation

[mernst]

This pull request clarifies Javadoc for a method.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.21 🎉

Comparison is base (600933b) 79.64% compared to head (7c7662b) 79.86%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1635      +/-   ##
============================================
+ Coverage     79.64%   79.86%   +0.21%     
- Complexity     2187     2191       +4     
============================================
  Files           208      208              
  Lines          6657     6659       +2     
  Branches        364      364              
============================================
+ Hits           5302     5318      +16     
+ Misses         1141     1127      -14     
  Partials        214      214              

Impacted Files	Coverage Δ
...rc/main/java/org/kohsuke/github/GHPullRequest.java	78.19% <ø> (ø)

... and 2 files with indirect coverage changes

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