Fix docs

Signed-off-by: Joas Schilling <coding@schilljs.com>

README.rst

@@ -103,9 +103,8 @@ The openSUSE way
 * sudo zypper in texlive-threeparttable
 * sudo zypper in texlive-wrapfig
 * sudo zypper in texlive-multirow
-* cd user_manual
-* make latexpdf
-* okular _build/latex/NextcloudUserManual.pdf
+* make user-manual-pdf
+* okular user_manual/_build/latex/NextcloudUserManual.pdf
 
 The Debian/Ubuntu way
 ~~~~~~~~~~~~~~~~~~~~~
@@ -116,9 +115,9 @@ The Debian/Ubuntu way
 * sudo apt-get install texlive-fonts-recommended
 * sudo apt-get install texlive-latex-extra
 * sudo apt-get install texlive-latex-recommended
-* cd user_manual
-* make latexpdf
-* evince _build/latex/NextcloudUserManual.pdf
+* sudo apt-get install latexmk
+* make user-manual-pdf
+* evince user_manual/_build/latex/NextcloudUserManual.pdf
 
 The Arch Linux way
 ~~~~~~~~~~~~~~~~~~
@@ -127,9 +126,8 @@ The Arch Linux way
 * sudo pacman -S texlive-latexextra
 * sudo pip2 install rst2pdf sphinxcontrib-phpdomain
 * sudo ln -s /usr/bin/sphinx-build2 /usr/bin/sphinx-build
-* cd user_manual
-* make latexpdf
-* PDFVIEWER _build/latex/NextcloudUserManual.pdf
+* make user-manual-pdf
+* PDFVIEWER user_manual/_build/latex/NextcloudUserManual.pdf
 
 Windows
 ^^^^^^^

admin_manual/configuration_server/occ_command.rst

@@ -34,7 +34,7 @@ occ command Directory
 * :ref:`security_commands_label`
 * :ref:`trashbin_label`
 * :ref:`user_commands_label`
-* :ref:`_group_commands_label`
+* :ref:`group_commands_label`
 * :ref:`versions_label`
 * :ref:`command_line_installation_label`
 * :ref:`command_line_upgrade_label`
@@ -1125,7 +1125,7 @@ authentication servers such as LDAP::
 .. _group_commands_label:
 
 Group commands
--------------
+--------------
 
 The ``group`` commands create and remove groups, add and remove users in
 groups, display a list of all users in a group::