(usage): Merge lone "\n" into adjacent string.

src/join.c

@@ -172,8 +172,6 @@ by whitespace.  When FILE1 or FILE2 (not both) is -, read standard input.\n\
       fputs (VERSION_OPTION_DESCRIPTION, stdout);
       fputs (_("\
 \n\
-"), stdout);
-      fputs (_("\
 Unless -t CHAR is given, leading blanks separate fields and are ignored,\n\
 else fields are separated by CHAR.  Any FIELD is a field number counted\n\
 from 1.  FORMAT is one or more comma or blank separated specifications,\n\

src/md5sum.c

@@ -147,10 +147,8 @@ The following two options are useful only when verifying checksums:\n\
 "), stdout);
       fputs (HELP_OPTION_DESCRIPTION, stdout);
       fputs (VERSION_OPTION_DESCRIPTION, stdout);
-      fputs (_("\
-\n\
-"), stdout);
       printf (_("\
+\n\
 The sums are computed as described in %s.  When checking, the input\n\
 should be a former output of this program.  The default mode is to print\n\
 a line with checksum, a character indicating type (`*' for binary, ` ' for\n\