Documentation/hpet.txt typo

Fix a typo.  Requested by Petr Vandrovec.

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

Documentation/hpet.txt

@@ -2,7 +2,7 @@
 
 The High Precision Event Timer (HPET) hardware is the future replacement
 for the 8254 and Real Time Clock (RTC) periodic timer functionality.
-Each HPET can have up two 32 timers.  It is possible to configure the
+Each HPET can have up to 32 timers.  It is possible to configure the
 first two timers as legacy replacements for 8254 and RTC periodic timers.
 A specification done by Intel and Microsoft can be found at
 <http://www.intel.com/hardwaredesign/hpetspec.htm>.