sdef, xml2man: add page (#7927)

pages/osx/sdef.md

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+# sdef
+
+> Get or generate a scripting definitions (`sdef`) file from a scriptable application.
+> More information: <https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/ScriptableCocoaApplications/SApps_creating_sdef/SAppsCreateSdef.html>.
+
+- Print the scripting definitions of the given application:
+
+`sdef {{/Applications/XCode.app}}`

pages/osx/xml2man.md

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+# xml2man
+
+> Compile MPGL to mdoc.
+> More information: <https://developer.apple.com/library/archive/documentation/DeveloperTools/Conceptual/HeaderDoc/mpgl/mpgl.html>.
+
+- Compile an MPGL file to a viewable man page:
+
+`xml2man {{path/to/command.mxml}}`
+
+- Compile an MPGL file to a specific output file:
+
+`xml2man {{path/to/service.mxml}} {{path/to/service.7}}`
+
+- Compile an MPGL file to a specific output file, overwriting if it already exists:
+
+`xml2man -f {{path/to/function.mxml}} {{path/to/function.3}}`