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

pages/common/mdatopbm.md

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