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/gnmic-set.md

@@ -7,11 +7,11 @@
 
 `gnmic --address {{ip:port}} set --update-path {{path}} --update-value {{value}}`
 
-- Update the value of a path to match the contents of a json file:
+- Update the value of a path to match the contents of a JSON file:
 
 `gnmic -a {{ip:port}} set --update-path {{path}} --update-file {{filepath}}`
 
-- Replace the value of a path to match the contents of a json file:
+- Replace the value of a path to match the contents of a JSON file:
 
 `gnmic -a {{ip:port}} set --replace-path {{path}} --replace-file {{filepath}}`