articles/contributing: Suggest checking build warnings through our CI

[bcr]

Minor wording fix.

head/en_US.ISO8859-1/articles/contributing/article.xml

166–169

The use of "You" is discouraged, see here: https://www.freebsd.org/doc/en_US.ISO8859-1/books/fdp-primer/writing-style.html

You can write "A list of build warnings from our CI is obtained by selecting a build and checking "LLVM/Clang Warning" or similar.

[salvadore]

Remove the use of "You".

@bcr: Thanks for your comment!

[bcr]

Great, thank you. Can you commit it yourself or should I do it?

[salvadore]

I can commit it and I will do it in a minute.
Thanks!