doc: modified memory set statement set size

PR-URL: #35517
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>

doc/api/v8.md

@@ -137,7 +137,7 @@ Returns an object with the following properties:
 
 `does_zap_garbage` is a 0/1 boolean, which signifies whether the
 `--zap_code_space` option is enabled or not. This makes V8 overwrite heap
-garbage with a bit pattern. The RSS footprint (resident memory set) gets bigger
+garbage with a bit pattern. The RSS footprint (resident set size) gets bigger
 because it continuously touches all heap pages and that makes them less likely
 to get swapped out by the operating system.