macptopbm, pbmtoxbm: edit pages; mdatopbm, mgrtopbm, pbmtomacp, pbmtomda, pbmtomgr, pbmtonokia: add pages (#12225)

pages/common/pbmtomda.md

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+# pbmtomda
+
+> Convert a PBM image to a Microdesign MDA file.
+> See also: `mdatopbm`.
+> More information: <https://netpbm.sourceforge.net/doc/pbmtomda.html>.
+
+- Convert a PBM image to a MDA file:
+
+`pbmtomda {{path/to/image.pbm}} > {{path/to/output.mda}}`
+
+- Invert the colors in the input image:
+
+`pbmtomda -i {{path/to/image.pbm}} > {{path/to/output.mda}}`
+
+- Halve the input image's height:
+
+`pbmtomda -d {{path/to/image.pbm}} > {{path/to/output.mda}}`