docs: Remove various Python 2 related references

docs/api/base.rst

@@ -52,20 +52,19 @@ Other Classes and Functions
 .. class:: text()
 
     This type only exists for documentation purposes. It represents
-    :obj:`unicode` under Python 2 and :obj:`str` under Python 3.
+    :obj:`python:str` under Python 3.
 
 
 .. class:: bytes()
 
     This type only exists for documentation purposes. It represents
-    :obj:`python:str` under Python 2 and :obj:`python3:bytes` under Python 3.
+    :obj:`python:bytes` under Python 3.
 
 
 .. class:: fspath()
 
     This type only exists for documentation purposes. It represents a file
-    name which can be :obj:`python:str` or :obj:`python:unicode` under Python
-    2 and :obj:`python3:bytes` or :obj:`python3:str` under Python 3.
+    name which can be :obj:`python:str` or :obj:`python:bytes` under Python 3.
 
 .. class:: fileobj()
 

docs/conf.py

@@ -16,8 +16,7 @@
     'sphinx.ext.extlinks',
 ]
 intersphinx_mapping = {
-    'python': ('https://docs.python.org/2', None),
-    'python3': ('https://docs.python.org/3', None),
+    'python': ('https://docs.python.org/3', None),
 }
 source_suffix = '.rst'
 master_doc = 'index'

docs/index.rst

@@ -31,13 +31,13 @@ Installing
 
 ::
 
-    pip install mutagen
+    python3 -m pip install mutagen
 
 or
 
 ::
 
-    sudo apt-get install python-mutagen python3-mutagen
+    sudo apt-get install python3-mutagen
 
 
 Where do I get it?

docs/user/filelike.rst

@@ -5,9 +5,8 @@ Working with File-like Objects
 .. currentmodule:: mutagen
 
 The first argument passed to a :class:`FileType` or :class:`Metadata` can
-either be a file name or a file-like object, such as `StringIO
-<StringIO.StringIO>`  (`BytesIO <io.BytesIO>` in Python 3) and mutagen will
-figure out what to do.
+either be a file name or a file-like object, such as `BytesIO <io.BytesIO>`
+and mutagen will figure out what to do.
 
 ::