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

[Florian Festi]

@ffesti commented on this pull request.



> +
+*%{span:*_STRING_*}*
+	As-is string, handy for wrapping multiline macros.
+	Since 6.0.0.
+
+	Example:
+	```
+	%{span:
+		%one thing
+		%another thing
+	}
+	```
+
+*%{sub:*_STRING_, _I_, [,_J_]*}*
+	Expand to substring of _STRING_ that starts at *I* and continues
+	until *J*. *I* and *J* can be negative. If *J* is absent, then

May be
...can be negative **to index from the string's end** 

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