doc: remove confusing "cats" from style guide

PR-URL: nodejs#19246
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Jon Moss <me@jonathanmoss.me>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/STYLE_GUIDE.md

@@ -17,7 +17,7 @@
   * Pronouns are acceptable in more colloquial documentation, like guides.
   * Use gender-neutral pronouns and mass nouns. Non-comprehensive
     examples:
-    * OK: "they", "their", "them", "folks", "people", "developers", "cats"
+    * OK: "they", "their", "them", "folks", "people", "developers"
     * NOT OK: "his", "hers", "him", "her", "guys", "dudes"
 * When combining wrapping elements (parentheses and quotes), terminal
   punctuation should be placed: