Grammar and spelling fixes

Spelling errors found using github.com/lucasdemarchi/codespell
A tool to fix common misspellings.
This tool is licensed under GNU General Public License, version 2.
Some additional grammar and capitalization errors were fixed as well.

Change-Id: I700db4e6d7ba52b02374c9c3e84be0af8bd91859
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/ipmisensor.cpp b/ipmisensor.cpp
index 2e987d0..1eecb94 100644
--- a/ipmisensor.cpp
+++ b/ipmisensor.cpp
@@ -122,7 +122,7 @@
 
 		case 0x00 : snprintf(p, sizeof(valuestring), "POST Error, %s", event_data_lookup(g_fwprogress00h, pRec->event_data2));
 					break;
-		case 0x01 : /* Using g_fwprogress02h for 0x01 because thats what the ipmi spec says to do */
+		case 0x01 : /* Using g_fwprogress02h for 0x01 because that's what the ipmi spec says to do */
 					snprintf(p, sizeof(valuestring), "FW Hang, %s", event_data_lookup(g_fwprogress02h, pRec->event_data2));
 					break;
 		case 0x02 : snprintf(p, sizeof(valuestring), "FW Progress, %s", event_data_lookup(g_fwprogress02h, pRec->event_data2));