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/img2pdf.md

@@ -3,9 +3,9 @@
 > Command-line lossless converter of raster images to PDF.
 > More information: <https://gitlab.mister-muffin.de/josch/img2pdf>.
 
-- Convert multiple images to a single PDF, each image being on its own page:
+- Convert one or more images to a single PDF, each image being on its own page:
 
-`img2pdf {{path/to/image1.jpg}} {{path/to/image2.jpg}} --output {{path/to/file.pdf}}`
+`img2pdf {{path/to/image1.jpg path/to/image2.jpg ...}} --output {{path/to/file.pdf}}`
 
 - Convert only the first frame of a multi-frame image to PDF: