Clarity.

Existing Wording:

The contents of the resulting tag will be whatever comes after the tag definition until the end of the line, or the comment-block, whatever comes first. To support tag values that span lines, enclose the content of the tag with @@:

Proposed Wording:

The contents of the resulting tag will be either whatever comes after the tag definition until the end of the line, or the comment-block, whatever comes first. To support tag values that span lines, enclose the content of the tag with @@: