Changed 'Signed-off-by:' to 'Signed-off-by: line'

Signed-off-by: Graham <gpe@openrs2.dev>

README.md

@@ -98,8 +98,8 @@ requirements of the DCO, a `Signed-off-by:` line must be added to the Git
 commit message by passing `--signoff` to the `git commit` invocation.
 
 If you intend to make a large number of contributions, run the following
-commands from the repository root to add `Signed-off-by:` to all your commit
-messages by default:
+commands from the repository root to add `Signed-off-by:` line to all your
+commit messages by default:
 
 ```
 echo -e "\n\nSigned-off-by: $(git config user.name) <$(git config user.email)>" > .git/commit-template