dpkg-query: add --search option, use long form of short options (#8228)

* dpkg-query: add --search option, use long form of short options

* Update pages/linux/dpkg-query.md

Co-authored-by: Axel Navarro <navarroaxel@gmail.com>

* Update pages/linux/dpkg-query.md

Co-authored-by: Axel Navarro <navarroaxel@gmail.com>

* Update pages/linux/dpkg-query.md

Co-authored-by: Axel Navarro <navarroaxel@gmail.com>

* dpkg-query: use concrete examples for user-provided values

Co-authored-by: Axel Navarro <navarroaxel@gmail.com>

pages/linux/dpkg-query.md

@@ -5,16 +5,20 @@
 
 - List all installed packages:
 
-`dpkg-query -l`
+`dpkg-query --list`
 
 - List installed packages matching a pattern:
 
-`dpkg-query -l '{{pattern}}'`
+`dpkg-query --list '{{libc6*}}'`
 
 - List all files installed by a package:
 
-`dpkg-query -L {{package_name}}`
+`dpkg-query --listfiles {{libc6}}`
 
 - Show information about a package:
 
-`dpkg-query -s {{package_name}}`
+`dpkg-query --status {{libc6}}`
+
+- Search for packages that own files matching a pattern:
+
+`dpkg-query --search {{/etc/ld.so.conf.d}}`