Typos and inconsistencies in code

Hi,

Please find the attached patch having the fix for the typos and
inconsistencies present in code.
The patch contains the following changes:
1) attibute -> attribute
2) efficent -> efficient
3) becuase -> because
4) fallthru -> fall through
5) uncoming -> upcoming
6) ans -> and
7) requrested -> requested
8) peforming -> performing
9) heartbearts -> heartbeats
10) parametrizing -> parameterizing
11) uninit -> uninitialized
12) bufgr -> bufmgr
13) directi -> direct
14) thead -> thread
15) somthing -> something
16) freek -> freak
17) changesd -> changes

Let me know your thoughts on the same.

Regards,
Vignesh
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