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/common/pip3.md

@@ -3,25 +3,21 @@
 > Python package manager.
 > More information: <https://pip.pypa.io>.
 
-- Find available packages:
-
-`pip3 search {{package_name}}`
-
 - Install a package:
 
-`pip3 install {{package_name}}`
+`pip3 install {{package}}`
 
 - Install a specific version of a package:
 
-`pip3 install {{package_name}}=={{package_version}}`
+`pip3 install {{package}}=={{version}}`
 
 - Upgrade a package:
 
-`pip3 install --upgrade {{package_name}}`
+`pip3 install --upgrade {{package}}`
 
 - Uninstall a package:
 
-`pip3 uninstall {{package_name}}`
+`pip3 uninstall {{package}}`
 
 - Save the list of installed packages to a file:
 
@@ -33,4 +29,4 @@
 
 - Show installed package info:
 
-`pip3 show {{package_name}}`
+`pip3 show {{package}}`