lcov.1, genhtml.1, geninfo.1: fix a typo (#405)

There was a spurious ‘not’ in the description of `--parallel`.

Signed-off-by: Reuben Thomas <[email protected]>

Author: rrthomas

man/genhtml.1

@@ -2150,7 +2150,7 @@ See the lcov man page for details.
 .BI "\-j "
 .I [ integer ]
 .RS
-Specify parallelism to use during processing (maximum number of forked child processes).  If the optional integer parallelism parameter is zero or is missing, then use to use up the number of cores on the machine.  Default is not to use a single process (no parallelism).
+Specify parallelism to use during processing (maximum number of forked child processes).  If the optional integer parallelism parameter is zero or is missing, then use to use up the number of cores on the machine.  Default is to use a single process (no parallelism).
 .br
 Also see the
 .I memory, memory_percentage, max_fork_fails

man/geninfo.1

@@ -1300,7 +1300,7 @@ generated:  host, date, environment,
 .BI "\-j "
 .I [ integer ]
 .RS
-Specify parallelism to use during processing (maximum number of forked child processes).  If the optional integer parallelism parameter is zero or is missing, then use to use up the number of cores on the machine.  Default is not to use a single process (no parallelism).
+Specify parallelism to use during processing (maximum number of forked child processes).  If the optional integer parallelism parameter is zero or is missing, then use to use up the number of cores on the machine.  Default is to use a single process (no parallelism).
 
 The
 .I \-\large\-file

man/lcov.1

@@ -1674,7 +1674,7 @@ Increment 'debug messages' verbosity.  This is useful primarily to developers wh
 .BI "\-j "
 .I [ integer ]
 .RS
-Specify parallelism to use during processing (maximum number of forked child processes).  If the optional integer parallelism parameter is zero or is missing, then use to use up the number of cores on the machine.  Default is not to use a single process (no parallelism).
+Specify parallelism to use during processing (maximum number of forked child processes).  If the optional integer parallelism parameter is zero or is missing, then use to use up the number of cores on the machine.  Default is to use a single process (no parallelism).
 .br
 Also see the
 .I memory, memory_percentage, max_fork_fails