[docs] Bump the trunk major version to 13 and update copyright year.

Author: mkurdej

clang/docs/conf.py

@@ -50,9 +50,9 @@
 # built documents.
 #
 # The short version.
-version = '12'
+version = '13'
 # The full version, including alpha/beta/rc tags.
-release = '12'
+release = '13'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

libcxx/docs/conf.py

@@ -11,6 +11,7 @@
 # serve to show the default.
 
 import sys, os
+from datetime import date
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
@@ -40,7 +41,7 @@
 
 # General information about the project.
 project = u'libc++'
-copyright = u'2011-2020, LLVM Project'
+copyright = u'2011-2021, LLVM Project' % date.today().year
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the