[gdb] Fix grammar in comments and docs

Fix grammar in some comments and docs:
- machines that doesn't -> machines that don't
- its a -> it's a
- its the -> it's the
- if does its not -> if it does it's not
- one more instructions if doesn't match ->
  one more instruction if it doesn't match
- it's own -> its own
- it's first -> its first
- it's pointer -> its pointer

I also came across "it's performance" in gdb/stubs/*-stub.c in the HP public
domain notice, I've left that alone.

Tested on x86_64-linux.

1 files changed, 1 insertions, 1 deletions

diff --git a/gdb/or1k-tdep.c b/gdb/or1k-tdep.c
index 5cef1fa..a472a76 100644
--- a/gdb/or1k-tdep.c
+++ b/gdb/or1k-tdep.c
@@ -360,7 +360,7 @@ or1k_delay_slot_p (struct gdbarch *gdbarch, CORE_ADDR pc)
 			   NULL, 32, &tmp_fields, 0);
 
   /* NULL here would mean the last instruction was not understood by cgen.
-     This should not usually happen, but if does its not a delay slot.  */
+     This should not usually happen, but if it does it's not a delay slot.  */
   if (insn == NULL)
     return 0;