[Rpm-maint] [rpm-software-management/rpm] Updated v3 and v4 package + header format documentation (PR #2861)

[Panu Matilainen]

@pmatilai commented on this pull request.



> +00000048: 00 00 00 00 00 01 00 05    ........
+```
+
+Bytes 76-77 ("00 01" above) form an int16 that indicates the OS the
+package was built for.  In this case, 1 == Linux.  The next 2 bytes
+(78-79) form an int16 that indicates the signature type.  This tells
+RPM what to expect in the Signature.  For version 3.0 packages, this
+is 5, which indicates the new "Header-style" signatures.
+
+```
+00000050: 04 00 00 00 68 e6 ff bf    ........
+00000058: ab ad 00 08 3c eb ff bf    ........
+```
+
+The remaining 16 bytes (80-95) are currently unused and are reserved
+for future expansion.

Yeah I think I just cut this out from the main doc without much editing, any mention of "currently" is basically an indication of 20+ year old sentence :laughing: 

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