Fix the description of what happens when the output file already exists.
.IP \[bu] 2
.IP \[bu] 2
otherwise write the data the the named file: note that is a file by
.IP \[bu] 2
.IP \[bu] 2
otherwise write the data the the named file: note that is a file by
-that name already exists, a warning is issued and profiling is
-disabled.
+that name already exists, it is truncated.
.RE
.IP \[bu] 2
\f[I]report\f[]: the profiling data is sent to mprof-report, which
.RE
.IP \[bu] 2
\f[I]report\f[]: the profiling data is sent to mprof-report, which