Improve class docs for CheckTrigger, CheckVar and SetVar

doc_classes/BTCheckTrigger.xml

@@ -4,14 +4,16 @@
 		BT condition that checks a trigger (a boolean variable).
 	</brief_description>
 	<description>
-		BTCheckTrigger verifies whether the [member variable] is set to [code]true[/code]. If it is, the task changes it to [code]false[/code] and returns [code]SUCCESS[/code]. Otherwise, it returns [code]FAILURE[/code].
+		BTCheckTrigger verifies whether the [member variable] is set to [code]true[/code]. If it is, the task switches it to [code]false[/code] and returns [code]SUCCESS[/code]. Otherwise, it returns [code]FAILURE[/code].
+		BTCheckTrigger can function as a "gate" within a [BTSequence]: when the trigger variable is set to [code]true[/code], it permits the execution of subsequent tasks and then changes the variable to [code]false[/code].
 	</description>
 	<tutorials>
 	</tutorials>
 	<members>
 		<member name="variable" type="String" setter="set_variable" getter="get_variable" default="&quot;&quot;">
-			A boolean variable on the blackboard that is used as a trigger.
-			When it is set to [code]true[/code], BTCheckTrigger will flip it to [code]false[/code] and return [code]SUCCESS[/code]. Otherwise, it will return [code]FAILURE[/code].
+			A boolean variable on the [member blackboard] used as a trigger.
+			If variable's value is [code]true[/code], BTCheckTrigger will switch it to [code]false[/code] and return [code]SUCCESS[/code].
+			If variable's value is [code]false[/code], BTCheckTrigger will return [code]FAILURE[/code].
 		</member>
 	</members>
 </class>

doc_classes/BTCheckVar.xml

@@ -4,19 +4,19 @@
 		BT condition that checks a variable on the blackboard.
 	</brief_description>
 	<description>
-		BTCheckVar checks [member variable] against [member value] and returns [code]SUCCESS[/code] or [code]FAILURE[/code] based on the [member check_type].
+		BTCheckVar evaluates the [member variable] against [member value] and returns [code]SUCCESS[/code] or [code]FAILURE[/code] based on the [member check_type].
 	</description>
 	<tutorials>
 	</tutorials>
 	<members>
 		<member name="check_type" type="int" setter="set_check_type" getter="get_check_type" enum="LimboUtility.CheckType" default="0">
-			Type of check to perform.
+			The type of check to be performed.
 		</member>
 		<member name="value" type="BBVariant" setter="set_value" getter="get_value">
-			Parameter that specifies the value to which the [member variable] will be compared.
+			A parameter that specifies the value against which the [member variable] will be compared.
 		</member>
 		<member name="variable" type="String" setter="set_variable" getter="get_variable" default="&quot;&quot;">
-			Variable name to check its value.
+			The name of the variable to check its value.
 		</member>
 	</members>
 </class>

doc_classes/BTSetVar.xml

@@ -4,6 +4,8 @@
 		BT action that assigns [member value] to the [member variable] and then returns [code]SUCCESS[/code].
 	</brief_description>
 	<description>
+		BTSetVar assigns [member value] to the [member variable] and then returns [code]SUCCESS[/code].
+		Returns [code]FAILURE[/code] if it fails to set the [member variable].
 	</description>
 	<tutorials>
 	</tutorials>
@@ -12,7 +14,7 @@
 			Parameter that specifies the value to be assigned to the variable.
 		</member>
 		<member name="variable" type="String" setter="set_variable" getter="get_variable" default="&quot;&quot;">
-			Variable name whose value is to be assigned.
+			Name of the variable to which the value will be assigned.
 		</member>
 	</members>
 </class>

doc_classes/BTTimeLimit.xml

@@ -4,7 +4,7 @@
 		BT decorator that sets a time limit for its child's execution.
 	</brief_description>
 	<description>
-		BTTimeLimit allocates a limited time for the child's execution and cancels it, returning [code]FAILURE[/code] if the [member time_limit] is exceeded.
+		BTTimeLimit allocates a limited time for the child's execution and aborts it, returning [code]FAILURE[/code] if the [member time_limit] is exceeded.
 		Returns [code]FAILURE[/code] if the [member time_limit] is exceeded; otherwise, it returns the status of the child task.
 	</description>
 	<tutorials>