9842 man page typos and spelling

*** 356,367 ****
  duplicate of the string pointed to by  \fIs1\fR. The returned pointer can be
  passed to \fBfree()\fR. The space for the new string is obtained using
  \fBmalloc\fR(3C). If the new string cannot be created, a null pointer is
  returned and \fBerrno\fR may be set to \fBENOMEM\fR to indicate that the
  storage space available is insufficient. The \fBstrndup()\fR function is
! identical to \fBstrdup()\fR, execept it copies at most \fIn\fR bytes from
! \fBs1\fR and ensures the copied string is awlays null terminated.
  .LP
  The functions \fBstrdupa()\fR and \fBstrndupa()\fR behave identically to
  \fBstrdup()\fR and \fBstrndup()\fR respectively; however, instead of allocating
  memory using \fBmalloc\fR(3C), they use \fBalloca\fR(3C). These functions are
  provided for compatibility only, their use is strongly discouraged due to their
--- 356,367 ----
  duplicate of the string pointed to by  \fIs1\fR. The returned pointer can be
  passed to \fBfree()\fR. The space for the new string is obtained using
  \fBmalloc\fR(3C). If the new string cannot be created, a null pointer is
  returned and \fBerrno\fR may be set to \fBENOMEM\fR to indicate that the
  storage space available is insufficient. The \fBstrndup()\fR function is
! identical to \fBstrdup()\fR, except it copies at most \fIn\fR bytes from
! \fBs1\fR and ensures the copied string is always null terminated.
  .LP
  The functions \fBstrdupa()\fR and \fBstrndupa()\fR behave identically to
  \fBstrdup()\fR and \fBstrndup()\fR respectively; however, instead of allocating
  memory using \fBmalloc\fR(3C), they use \fBalloca\fR(3C). These functions are
  provided for compatibility only, their use is strongly discouraged due to their