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/conda-install.md

@@ -3,9 +3,9 @@
 > Install packages into an existing conda environment.
 > More information: <https://docs.conda.io/projects/conda/en/latest/commands/install.html>.
 
-- Install a single package into the currently active conda environment:
+- Install one or more package into the currently active conda environment:
 
-`conda install {{package}}`
+`conda install {{package1 package2 ...}}`
 
 - Install a single package into the currently active conda environment using channel conda-forge:
 
@@ -15,10 +15,6 @@
 
 `conda install -c conda-forge --override-channels {{package}}`
 
-- Install multiple packages:
-
-`conda install {{package1 package2 ...}}`
-
 - Install a specific version of a package:
 
 `conda install {{package}}={{version}}`