Adds 'Snapcraft' to spelling exceptions list

This word is commonly used in the CLI docs - let's get it added here.

Adds 'Snapcraft' to spelling exceptions list
d238c733 · Amy Qualls · b1c5b473 · d238c733
--- a/doc/.vale/gitlab/spelling-exceptions.txt
+++ b/doc/.vale/gitlab/spelling-exceptions.txt
@@ -918,6 +918,7 @@ smartcard
 smartcards
 snake_case
 snake_cased
+Snapcraft
 snapshotting
 Snowplow
 Snyk