pages/*, style-guide: update contents, fix Markdown (#10492)

* pages/*, style-guide: update pages, fix Markdown (commit 1)

* Update pages

* style-guide.de: update page

* Apply suggestions from code review

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

* pip3: remove search command

* rpm: update path placeholder

Co-authored-by: pixel <pixel+github@chrissx.de>

* Update pages/linux/pkgfile.md

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

---------

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>
Co-authored-by: pixel <pixel+github@chrissx.de>

pages/linux/pacman-sync.md

@@ -6,7 +6,7 @@
 
 - Install a new package:
 
-`sudo pacman --sync {{package_name}}`
+`sudo pacman --sync {{package}}`
 
 - Synchronize and update all packages (add `--downloadonly` to download the packages and not update them):
 
@@ -14,7 +14,7 @@
 
 - Update all packages and install a new one without prompting:
 
-`sudo pacman --sync --refresh --sysupgrade --noconfirm {{package_name}}`
+`sudo pacman --sync --refresh --sysupgrade --noconfirm {{package}}`
 
 - Search the package database for a regular expression or keyword:
 
@@ -22,7 +22,7 @@
 
 - Display information about a package:
 
-`pacman --sync --info {{package_name}}`
+`pacman --sync --info {{package}}`
 
 - Overwrite conflicting files during a package update:
 
@@ -30,7 +30,7 @@
 
 - Synchronize and update all packages, but ignore a specific package (can be used more than once):
 
-`sudo pacman --sync --refresh --sysupgrade --ignore {{package_name}}`
+`sudo pacman --sync --refresh --sysupgrade --ignore {{package}}`
 
 - Remove not installed packages and unused repositories from the cache (use two `--clean` flags to clean all packages):