Bump Ubuntu version to 14.10 in documentation

Ubuntu 14.10 has Vim 7.4.273.

README.md

@@ -210,10 +210,10 @@ that are conservatively turned off by default that you may want to turn on.
 Please refer to the full Installation Guide below; the following commands are
 provided on a best-effort basis and may not work for you.
 
-Make sure you have Vim 7.4.143 with python2 or python3 support. Ubuntu 14.04 and
-later have a Vim that's recent enough. You can see the version of Vim installed
-by running `vim --version`. If the version is too old, you may need to [compile
-Vim from source][vim-build] (don't worry, it's easy).
+Make sure you have Vim 7.4.143 with Python 2 or Python 3 support. Ubuntu 14.10
+and later have a Vim that's recent enough. You can see the version of Vim
+installed by running `vim --version`. If the version is too old, you may need to
+[compile Vim from source][vim-build] (don't worry, it's easy).
 
 Install YouCompleteMe with [Vundle][].
 

doc/youcompleteme.txt

@@ -404,7 +404,7 @@ Ubuntu Linux x64 ~
 Please refer to the full Installation Guide below; the following commands are
 provided on a best-effort basis and may not work for you.
 
-Make sure you have Vim 7.4.143 with python2 or python3 support. Ubuntu 14.04
+Make sure you have Vim 7.4.143 with Python 2 or Python 3 support. Ubuntu 14.10
 and later have a Vim that's recent enough. You can see the version of Vim
 installed by running 'vim --version'. If the version is too old, you may need
 to compile Vim from source [26] (don't worry, it's easy).