ALSA: Documentation: fix some typos

s/PAUSE_PUSE/PAUSE_PUSH/
s/happense/happens/
Signed-off-by: Antonio Ospite <ao2@amarulasolutions.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Documentation/DocBook/writing-an-alsa-driver.tmpl

@@ -2897,7 +2897,7 @@ struct _snd_pcm_runtime {
 
         <para>
           When the pcm supports the pause operation (given in the info
-        field of the hardware table), the <constant>PAUSE_PUSE</constant>
+        field of the hardware table), the <constant>PAUSE_PUSH</constant>
         and <constant>PAUSE_RELEASE</constant> commands must be
         handled here, too. The former is the command to pause the pcm,
         and the latter to restart the pcm again. 
@@ -3084,7 +3084,7 @@ struct _snd_pcm_runtime {
       <section id="pcm-interface-interrupt-handler-timer">
         <title>High frequency timer interrupts</title>
         <para>
-	This happense when the hardware doesn't generate interrupts
+	This happens when the hardware doesn't generate interrupts
         at the period boundary but issues timer interrupts at a fixed
         timer rate (e.g. es1968 or ymfpci drivers). 
         In this case, you need to check the current hardware