Add frozenset, isspace, rstrip to cspell dictionary

Author: jbutcher21

.vscode/cspell.json

@@ -128,6 +128,7 @@
     "FORCEPURGE",
     "fpvs",
     "FROMVERSION",
+    "frozenset",
     "FRSX",
     "ftype",
     "ftypes",
@@ -158,6 +159,7 @@
     "isinstance",
     "isnumeric",
     "isort",
+    "isspace",
     "ISVIRTUAL",
     "itemgetter",
     "iterdir",
@@ -271,6 +273,7 @@
     "rfind",
     "rglob",
     "ROYALBLUE",
+    "rstrip",
     "RTNVAL",
     "RTYPE",
     "RTYPEID",