urpmi: add pages (#12025)

pages/linux/urpmf.md

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+# urpmf
+
+> Find files in packages and query information about them in Mageia.
+> See also: `urpmi`, `urpme`, `urpmi.addmedia`, `urpmi.removemedia`, `urpmi.update`, `urpmq`.
+> More information: <https://wiki.mageia.org/en/URPMI#urpmi.removemedia>.
+
+- Search for packages that contain a file:
+
+`urpmf {{filename}}`
+
+- Search for packages that contain both a keyword [a]nd another in their summaries:
+
+`urpmf --summary {{keyword1}} -a {{keyword2}}`
+
+- Search for packages that contain a keyword [o]r another in their descriptions:
+
+`urpmf --description {{keyword1}} -o {{keyword2}}`
+
+- Search for packages that do not contain a keyword in their name ignoring case distinction using "|" as the [F]ield separator (":" by default):
+
+`urpmf --description ! {{keyword}} -F'|'`