Minor: fix spelling.

git-svn-id: https://plugins.svn.wordpress.org/broken-link-checker/trunk@1032416 b8457f37-d9ea-0310-8a92-e5e31aec5664
Add a note below the "link tweaks" settings explaining that they only apply to the contents of posts (and pages, and CPTs), not comments or custom fields.

git-svn-id: https://plugins.svn.wordpress.org/broken-link-checker/trunk@1032418 b8457f37-d9ea-0310-8a92-e5e31aec5664