docs: Fix a few typo's in app docs (more then, resourse).

Change-Id: Iba57efadf6c0b822e762c7a001bc89611d98afd7

apps/app_chanisavail.c

@@ -56,10 +56,10 @@ static const char app[] = "ChanIsAvail";
 			<parameter name="Technology/Resource" required="true" argsep="&amp;">
 				<argument name="Technology2/Resource2" multiple="true">
 					<para>Optional extra devices to check</para>
-					<para>If you need more then one enter them as
+					<para>If you need more than one enter them as
-					Technology2/Resource2&amp;Technology3/Resourse3&amp;.....</para>
+					Technology2/Resource2&amp;Technology3/Resource3&amp;.....</para>
 				</argument>
-				<para>Specification of the device(s) to check.  These must be in the format of 
+				<para>Specification of the device(s) to check.  These must be in the format of
 				<literal>Technology/Resource</literal>, where <replaceable>Technology</replaceable>
 				represents a particular channel driver, and <replaceable>Resource</replaceable>
 				represents a resource available to that particular channel driver.</para>

apps/app_dial.c

@@ -84,12 +84,12 @@ ASTERISK_REGISTER_FILE()
 				</argument>
 				<argument name="Technology2/Resource2" required="false" multiple="true">
 					<para>Optional extra devices to dial in parallel</para>
-					<para>If you need more then one enter them as
+					<para>If you need more than one enter them as
-					Technology2/Resource2&amp;Technology3/Resourse3&amp;.....</para>
+					Technology2/Resource2&amp;Technology3/Resource3&amp;.....</para>
 				</argument>
 			</parameter>
 			<parameter name="timeout" required="false">
-				<para>Specifies the number of seconds we attempt to dial the specified devices</para>
+				<para>Specifies the number of seconds we attempt to dial the specified devices.</para>
 				<para>If not specified, this defaults to 136 years.</para>
 			</parameter>
 			<parameter name="options" required="false">
@@ -491,7 +491,7 @@ ASTERISK_REGISTER_FILE()
 
 			<para>Unless there is a timeout specified, the Dial application will wait
 			indefinitely until one of the called channels answers, the user hangs up, or
-			if all of the called channels are busy or unavailable. Dialplan executing will
+			if all of the called channels are busy or unavailable. Dialplan execution will
 			continue if no requested channels can be called, or if the timeout expires.
 			This application will report normal termination if the originating channel
 			hangs up, or if the call is bridged and either of the parties in the bridge

apps/app_page.c

@@ -60,7 +60,7 @@ ASTERISK_REGISTER_FILE()
 				<argument name="Technology2/Resource2" multiple="true">
 					<para>Optional extra devices to dial in parallel</para>
 					<para>If you need more than one, enter them as Technology2/Resource2&amp;
-					Technology3/Resourse3&amp;.....</para>
+					Technology3/Resource3&amp;.....</para>
 				</argument>
 			</parameter>
 			<parameter name="options">