remove a recommendation to install doc

content/install.rst

@@ -83,10 +83,7 @@ They need to be executed as root.
 3. Update the package data, and install Kwant::
 
        apt-get update
-       apt-get install python3-kwant python-kwant-doc
-
-   The ``python-kwant-doc`` package is optional and installs the HTML
-   documentation of Kwant in the directory ``/usr/share/doc/python-kwant-doc``.
+       apt-get install python3-kwant
 
 
 Ubuntu and derivatives
@@ -96,12 +93,10 @@ packages we provide.  Execute the following commands in a terminal::
 
     sudo apt-add-repository -s ppa:kwant-project/ppa
     sudo apt-get update
-    sudo apt-get install python3-kwant python-kwant-doc
+    sudo apt-get install python3-kwant
 
 This should provide up-to-date Kwant for all recent versions of Ubuntu,
-up to at least the last LTS version.  The HTML
-documentation will be installed locally in the directory
-``/usr/share/doc/python-kwant-doc``.
+up to at least the last LTS version.
 
 
 Debian or Ubuntu: building packages from source
@@ -127,7 +122,7 @@ Then, compile Tinyarray and Kwant.  This may be done as a normal user. ::
 Finally, install the built packages (again as root)::
 
     dpkg --install python3-tinyarray_*.deb
-    dpkg --install python3-kwant_*.deb python-kwant-doc_*.deb
+    dpkg --install python3-kwant_*.deb
 
 
 Arch Linux