[Bug-datamash] man fixes

[Dave Love]

I fixed a couple of warnings in the man page that generated warnings
from rpm packaging.  (You're welcome to the spec file for the packaging,
of course, but it seems someone is producing a different version.)

--- datamash-1.1.0/man/datamash.x~      2016-01-02 22:05:03.000000000 +0000
+++ datamash-1.1.0/man/datamash.x       2016-02-18 13:47:10.393433353 +0000
@@ -72,7 +72,7 @@
 .TP
 .B strbin[:BUCKET-SIZE]
 hashes the input and returns a numeric integer value between zero and
-\fBUCKET-SIZE\f (defaults to 10).
+\fBBUCKET-SIZE\fB (defaults to 10).
 
 .TP
 .B round/floor/ceil/trunc/frac
@@ -353,8 +353,8 @@
 .nf
 .RS
 .RE
-." NOTE: The weird spacing/alignment is due to extract backslash
-."       characters. Modify with caution.
+.\" NOTE: The weird spacing/alignment is due to extract backslash
+.\"       characters. Modify with caution.
 $ ( echo X ; seq \-1.25 0.25 1.25 ) \\
       | datamash \-\-full \-H round 1 ceil 1 floor 1 trunc 1 frac 1