[squash] Update processes/style-guide.md

Signed-off-by: Gerwin Klein <[email protected]>

processes/style-guide.md

@@ -248,7 +248,7 @@ anything in the general guide.
 * Do not use `typedef` to create a type alias for an `enum`; always
   specify `enum` types as `word_t` (otherwise, the `enum` size is
   determined by the compiler).
-* All `struct`s must be packed, i.e. not contain any implicit padding
+* All `struct` definitions must be packed, i.e. not contain any implicit padding
   that is inserted by the compiler (otherwise memory content is
   unspecified). Use explicit `padding` fields of the required type size to
   remove implicit compiler padding.