docs: filesystems: bcachefs: fixed some spelling mistakes in the bcac…

…hefs coding style page

Specifically, fixed spelling of "commit" and pluralization of last sentence.

Signed-off-by: Dennis Lam <dennis.lamerice@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Documentation/filesystems/bcachefs/CodingStyle.rst

@@ -183,4 +183,4 @@ even better as a code comment.
 A good code comment is wonderful, but even better is the comment that didn't
 need to exist because the code was so straightforward as to be obvious;
 organized into small clean and tidy modules, with clear and descriptive names
-for functions and variable, where every line of code has a clear purpose.
+for functions and variables, where every line of code has a clear purpose.