chore: fix spelling errors across the project (#10459)

Co-authored-by: Josh Soref <jsoref@users.noreply.github.com>

plugins/history-substring-search/history-substring-search.zsh

@@ -243,8 +243,8 @@ _history-substring-search-begin() {
     fi
 
     #
-    # Escape and join query parts with wildcard character '*' as seperator
-    # `(j:CHAR:)` join array to string with CHAR as seperator
+    # Escape and join query parts with wildcard character '*' as separator
+    # `(j:CHAR:)` join array to string with CHAR as separator
     #
     local search_pattern="*${(j:*:)_history_substring_search_query_parts[@]//(#m)[\][()|\\*?#<>~^]/\\$MATCH}*"