docs: fix spellcheck error for Ubuntu 22.04

Type: fix

Signed-off-by: Saima Yunus <yunus.saima.234@gmail.com>
Change-Id: I975990aeead6d34f0317a37e917bd92c0c89276e
diff --git a/docs/spelling_wordlist.txt b/docs/spelling_wordlist.txt
index 3e1ed1e..42fd67d 100644
--- a/docs/spelling_wordlist.txt
+++ b/docs/spelling_wordlist.txt
@@ -368,6 +368,7 @@
 fooB
 fooC
 foreach
+formatter
 Fortville
 fs
 fusermount