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

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

plugins/dotnet/dotnet.plugin.zsh

@@ -12,7 +12,7 @@ _dotnet_zsh_complete()
     return
   fi
 
-  # This is not a variable assigment, don't remove spaces!
+  # This is not a variable assignment, don't remove spaces!
   _values = "${(ps:\n:)completions}"
 }