Reformat readme.

README.txt

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-"UnrecognizedTags" is not an official Six Apart release, and as such support from Six Apart for this plugin is not available.
+The UnrecognizedTags plugin is a tool for identifying all tags in use across
+all templates system-wide that Movable Type does not recognize.
 
-The UnrecognizedTags plugin is a tool for identifying all tags in use across all templates system-wide that Movable Type does not recognize.
+Movable Type will throw an error message when it encounters an unrecognized
+tag in the course of rebuilding, or when you edit a template containing one,
+but this means that in order to identify all such tags you must either open
+every template or repeatedly rebuild, resolve or <mt:Ignore> the first tag
+encountered (which will stop the rebuild), and then try rebuilding again.
 
-Movable Type will throw an error message when it encounters an unrecognized tag in the course of rebuilding, or when you edit a template containing one, but this means that in order to identify all such tags you must either open every template or repeatedly rebuild, resolve or <mt:Ignore> the first tag encountered (which will stop the rebuild), and then try rebuilding again.
+UnrecognizedTags is intended to simplify this process. It can be especially
+useful when upgrading, or preparing to use or discontinue use of a particular
+plugin, or for large or legacy installations all of whose blogs and templates
+aren't fully understood by the people currently dealing with the system. 
 
-UnrecognizedTags is intended to simplify this process. It can be especially useful when upgrading, or preparing to use or discontinue use of a particular plugin, or for large or legacy installations all of whose blogs and templates aren't fully understood by the people currently dealing with the system. 
-
-The plugin adds an "Unrecognized Tags" menu item to the Tools menu at the System Overview level. When you select this item, UnrecognizedTags will generate and display a listing of all usages of unrecognized tags, grouped by tag, and listing the blog and template (with a link to edit the template) in which each usage occurs.
+The plugin adds an "Unrecognized Tags" menu item to the Tools menu at the
+System Overview level. When you select this item, UnrecognizedTags will
+generate and display a listing of all usages of unrecognized tags, grouped by
+tag, and listing the blog and template (with a link to edit the template) in
+which each usage occurs.