pages*: improve list placeholders and wording of descriptions (#12111)

* pages*: improve wording and list placeholders

* clamav: fix verb tenses

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

* buzzphrase: use k instead of n for number of phrases

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

* adguardhome: use non-default instead of different

* adguardhome: use configuration instead of config

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

* goimports, module: fix list placeholders

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

* pages*: leave stems and extensions in the same placeholders

* pages*: fix list placeholders

* pages*: fix list placeholders

* pages*: apply suggestions from code review

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

* qpdf: enclose n with backticks

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

---------

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/common/phpcs.md

@@ -17,7 +17,7 @@
 
 - Specify comma-separated file extensions to include when sniffing:
 
-`phpcs {{path/to/directory}} --extensions {{file_extension(s)}}`
+`phpcs {{path/to/directory}} --extensions {{file_extension1,file_extension2,...}}`
 
 - Specify the format of the output report (e.g. `full`, `xml`, `json`, `summary`):
 
@@ -29,7 +29,7 @@
 
 - A comma-separated list of files to load before processing:
 
-`phpcs {{path/to/directory}} --bootstrap {{file(s)}}`
+`phpcs {{path/to/directory}} --bootstrap {{path/to/file1,path/to/file2,...}}`
 
 - Don't recurse into subdirectories: