Add SIPB documentation license recommendation

diff --git a/doc/doc-licensing.mdwn b/doc/doc-licensing.mdwn
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+SIPB's official documentation licensing recommendation (`/afs/sipb.mit.edu/admin/text/policy/documentation_licensing.txt`) says:
+
+We recommend that the default license for SIPB documentation be the
+dual license of
+
+1.  the Creative Commons Attribution-Share Alike license, and
+2.  the GNU Free Documentation License, with no Invariant Sections, no
+    Front-Cover Texts, and no Back-Cover-Texts.