ppmtouil, pamtouil: add pages (#12414)

pages/common/pamtouil.md

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+# pamtouil
+
+> Convert a PNM or PAM file into a Motif UIL icon file.
+> More information: <https://netpbm.sourceforge.net/doc/pamtouil.html>.
+
+- Convert a PNM or PAM file into a Motif UIL icon file:
+
+`pamtouil {{path/to/input.pnm|pam}} > {{path/to/output.uil}}`
+
+- Specify a prefix string to be printed in the output UIL file:
+
+`pamtouil -name {{uilname}} {{path/to/input.pnm|pam}} > {{path/to/output.uil}}`

pages/common/ppmtouil.md

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+# ppmtouil
+
+> This command is superseded by `pamtouil`.
+> More information: <https://netpbm.sourceforge.net/doc/ppmtouil.html>.
+
+- View documentation for the current command:
+
+`tldr pamtouil`