ui: add helper text for input (PROJQUAY-7442)

[Sunandadadi]

[harishsurf]

minor comment, otherwise lgtm!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.44%. Comparing base (0cdd254) to head (ddb925a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3015      +/-   ##
==========================================
+ Coverage   70.43%   70.44%   +0.01%     
==========================================
  Files         440      440              
  Lines       41484    41516      +32     
  Branches     5440     5451      +11     
==========================================
+ Hits        29218    29248      +30     
- Misses      10548    10550       +2     
  Partials     1718     1718              

Flag	Coverage Δ
unit	70.44% <ø> (+0.01%)	⬆️

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[harishsurf]

lgtm!

[Sunandadadi]

/cherrypick redhat-3.12

[openshift-cherrypick-robot]

@Sunandadadi: new pull request created: #3017

In response to this:

/cherrypick redhat-3.12

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