doc: improve style guide text

* Specify that personal pronouns are OK in colloquial documentation rather than just pronouns. Pronouns are OK in all documentation. (For example, "it" is a pronoun and is acceptable in all types of documentation.) Specify "personal pronouns" for clarity. * more colloquial -> colloquial * like -> such as * Remove "mass nouns" as no mass nouns are given as examples. Plural nouns seems to be what was meant, so use that instead. * Repeat "gender-neutral" to make it clear that it refers to both terms and not merely the first term it appears before. * Remove "non-comprehensive examples". Examples are, by definition, non-comprehensive. No need to announce that the examples are examples. It is obvious. PR-URL: #19269 Reviewed-By: Luigi Pinca <[email protected]>

Author: Trott

doc/STYLE_GUIDE.md

@@ -14,9 +14,8 @@
  "color" vs. "colour", etc.
 * Use [serial commas][].
 * Avoid personal pronouns in reference documentation ("I", "you", "we").
-* Pronouns are acceptable in more colloquial documentation, like guides.
-* Use gender-neutral pronouns and mass nouns. Non-comprehensive
- examples:
+* Personal pronouns are acceptable in colloquial documentation such as guides.
+* Use gender-neutral pronouns and gender-neutral plural nouns.
 * OK: "they", "their", "them", "folks", "people", "developers"
 * NOT OK: "his", "hers", "him", "her", "guys", "dudes"
 * When combining wrapping elements (parentheses and quotes), terminal