[Rpm-maint] [rpm-software-management/rpm] Add a man page for rpm macro processor (PR #3781)

[Michal Domonkos]

@dmnks commented on this pull request.



> +%[1 < 2 ? "true" : "false"]
+```
+
+Compare versions, expanding to *1* or *0* on true/false:
+
+```
+%[ v"3.1.0-1" < v"1.0~alpha-2" ? 1 : 0]
+```
+
+Expands to *1* if *%aa* expands to *5*, otherwise expands to *2*:
+
+```
+%[ "%{aa}" == "5" ? 1 : 2]
+```
+
+# DEBUGGING

I'd add an example for `%{macrobody: ... }`, too. It's something I've only learned today (by reading about it here) and immediately thought - yes, that's what I needed many times in the past when debugging some unexpected macro expansions! :smile: 

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