a bit more docs, changelog for #518

docs/changelog.rst

@@ -17,6 +17,12 @@ consequences for all users are:
 For developers, the short version of the story is that Item and Album objects
 provide *uniform access* across fixed, flexible, and computed attributes.
 
+Unrelated new stuff:
+
+* The importer has a new interactive option ("as aLbums") that lets you split
+  apart albums that are mixed together in a single directory. Thanks to
+  geigerzaehler.
+
 Other little fixes:
 
 * :doc:`/plugins/echonest`: Tempo (BPM) is now always stored as an integer.

docs/guides/tagger.rst

@@ -46,10 +46,14 @@ all of these limitations.
   This means that your flat directory of six thousand uncategorized MP3s won't
   currently be autotaggable. (This will change eventually.)
 
-  There is one exception to this rule: directories that look like separate parts
-  of a *multi-disc album* are tagged together as a single release. If two
-  adjacent albums have a common prefix, followed by "disc," "disk," or "CD"
-  and then a number, they are tagged together.
+  There are a couple of exceptions to this rule. First, directories that look
+  like separate parts of a *multi-disc album* are tagged together as a single
+  release. If two adjacent albums have a common prefix, followed by "disc,"
+  "disk," or "CD" and then a number, they are tagged together.
+
+  Second, the *L* ("as aLbums") option described below can help you split a
+  directory containing multiple albums into its components. Use this for
+  disorganized jumbles of tracks.
 
 * The music may have bad tags, but it's not completely untagged. This is
   because beets by default infers tags based on existing metadata. But this is