Improve error message

Co-authored-by: Josefine Hansson <66409231+jhansson-ard@users.noreply.github.com>

Author: sebromero

scripts/validation/rules/rules-spelling.yml

@@ -53,7 +53,7 @@
   shouldMatch: false
   type: warning
   format: markdown
-  errorMessage: Megabyte should be abbreviated as MB, Megabit as Mb.
+  errorMessage: 'Megabyte' should be abbreviated as MB, 'Megabit' as Mb.
 
 # μm / mm spacing
 - regex: "(?<!\\S)\\b\\d+[μm]m\\b"