svgtopam, srftopam, pamtosrf: add pages (#15353)

pages/common/pamtosrf.md

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+# pamtosrf
+
+> Convert Netpbm images to SRF format.
+> See also: `srftopam`.
+> More information: <https://netpbm.sourceforge.net/doc/pamtosrf.html>.
+
+- Convert a Netpbm image or a stream of Netpbm images to SRF format:
+
+`pamtosrf {{path/to/file.pam}} > {{path/to/output.srf}}`

pages/common/srftopam.md

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+# srftopam
+
+> Convert an SRF file to Netpbm format.
+> See also: `pamtosrf`.
+> More information: <https://netpbm.sourceforge.net/doc/srftopam.html>.
+
+- Convert an SRF file to Netpbm format:
+
+`srftopam {{path/to/file.srf}} > {{path/to/output.pam}}`

pages/common/svgtopam.md

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+# svgtopam
+
+> Convert an SVG file to Netpbm format.
+> More information: <https://netpbm.sourceforge.net/doc/svgtopam.html>.
+
+- Convert an SVG file to Netpbm format:
+
+`svgtopam {{path/to/file.svg}} > {{path/to/output.pam}}`
+
+- Emit textual output describing the input image:
+
+`svgtopam -trace {{path/to/file.svg}}`