docs: fixed casing

[reZach]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

N/A

Motivation / Use-Case

The existing output of webpack serve --help lists descriptions beginning in a capital letter. The description for stdin does not begin with a capital letter.

Breaking Changes

N/A

Additional Info

N/A

[reZach]

Did not mean to submit this review!

[codecov]

Codecov Report

Merging #3008 (233d6ba) into master (89a7100) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3008   +/-   ##
=======================================
  Coverage   92.39%   92.39%           
=======================================
  Files          37       37           
  Lines        1262     1262           
  Branches      326      326           
=======================================
  Hits         1166     1166           
  Misses         91       91           
  Partials        5        5           

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[alexander-akait]

Thanks