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/windows/reg-flags.md

@@ -7,14 +7,10 @@
 
 `reg flags {{key_name}} query`
 
-- Set specified space-separated flags, and unset unmentioned flags, for a specific key:
+- Set one or more flags, and unset unmentioned flags, for a specific key:
 
-`reg flags {{key_name}} set {{flag_names}}`
+`reg flags {{key_name}} set {{flag_name1 flag_name2 ...}}`
 
-- Set specified flags for a specific key and its sub keys:
+- Set one or more flags for a specific key and its [s]ub keys:
 
-`reg flags {{key_name}} set {{flag_names}} /s`
-
-- Display help and available flag types:
-
-`reg flags /?`
+`reg flags {{key_name}} set {{flag_name1 flag_name2 ...}} /s`