some minor comment fix in md.c - Mailing list pgsql-hackers

Hi,

Here are few minor fix in md.c comments

src/backend/storage/smgr/md.c

1. @L174 - removed the unnecessary word "is".

- […] Note that this is breaks mdnblocks() and related functionality [...]

+ […] Note that this breaks mdnblocks() and related functionality [...]

2. @L885 - grammar fix

- We used to pass O_CREAT here, but that's has the disadvantage that it might [...]

+ We used to pass O_CREAT here, but that has the disadvantage that it might [...]

Regards,

Kirk J.