silly tiny bug

doc/bugs/inconsistent_use_of_SI_prefixes.mdwn

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+### Please describe the problem.
+
+`git annex status` inconsistently uses mebi (SI) and giga (informal) prefixes.
+
+### What steps will reproduce the problem?
+
+Example:
+
+[[!format txt """
+anarcat@marcos:mp3$ git annex status
+supported backends: SHA256E SHA1E SHA512E SHA224E SHA384E SHA256 SHA1 SHA512 SHA224 SHA384 WORM URL
+supported remote types: git S3 bup directory rsync web glacier hook
+repository mode: direct
+trusted repositories: 0
+semitrusted repositories: 2
+        00000000-0000-0000-0000-000000000001 -- web
+        b7802161-c984-4c9f-8d05-787a29c41cfe -- here (anarcat@marcos:/srv/mp3)
+untrusted repositories: 0
+transfers in progress: none
+available local disk space: 31.93 gigabytes (+1 megabyte reserved)
+local annex keys: 19913
+local annex size: 111.08 gigabytes
+known annex keys: 20085
+known annex size: 111.38 gigabytes
+bloom filter size: 16 mebibytes (3.1% full)
+backend usage:
+        SHA256E: 39998
+"""]]
+
+Notice `mebibytes` and `gigabytes`. It is unclear whether those are gigabytes (1000^3) or gibibytes (1024^3).
+
+### What version of git-annex are you using? On what operating system?
+
+4.20130802~bpo70+2, Debian wheezy.
+
+### Please provide any additional information below.
+
+nil.