* src/numfmt.c (usage): Change erroneous "G" to "M".
auto Accept optional single-letter/two-letter suffix:\n\
1K = 1000\n\
1Ki = 1024\n\
- 1G = 1000000\n\
- 1Gi = 1048576\n\
+ 1M = 1000000\n\
+ 1Mi = 1048576\n\
si Accept optional single letter suffix:\n\
1K = 1000\n\
- 1G = 1000000\n\
+ 1M = 1000000\n\
...\n\
iec Accept optional single letter suffix:\n\
1K = 1024\n\
- 1G = 1048576\n\
+ 1M = 1048576\n\
...\n\
iec-i Accept optional two-letter suffix:\n\
1Ki = 1024\n\
- 1Gi = 1048576\n\
+ 1Mi = 1048576\n\
...\n\
\n\
"), stdout);