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/snap.md

@@ -6,19 +6,19 @@
 
 - Search for a package:
 
-`snap find {{package_name}}`
+`snap find {{query}}`
 
 - Install a package:
 
-`snap install {{package_name}}`
+`snap install {{package}}`
 
 - Update a package:
 
-`snap refresh {{package_name}}`
+`snap refresh {{package}}`
 
 - Update a package to another channel (track, risk, or branch):
 
-`snap refresh {{package_name}} --channel={{channel}}`
+`snap refresh {{package}} --channel={{channel}}`
 
 - Update all packages:
 
@@ -30,7 +30,7 @@
 
 - Uninstall a package:
 
-`snap remove {{package_name}}`
+`snap remove {{package}}`
 
 - Check for recent snap changes in the system: