fix(website): VRL functions return types

Author: thomasqueirozb

website/cue/reference/remap/functions/assert.cue

@@ -37,7 +37,7 @@ remap: functions: assert: {
 	internal_failure_reasons: [
 		"`condition` evaluates to `false`.",
 	]
-	return: types: ["null"]
+	return: types: ["boolean"]
 
 	examples: [
 		{

website/cue/reference/remap/functions/del.cue

@@ -36,7 +36,7 @@ remap: functions: del: {
 			""",
 	]
 	return: {
-		types: ["any"]
+		types: ["any", "null"]
 		rules: [
 			"Returns the value of the field being deleted. Returns `null` if the field doesn't exist.",
 		]

website/cue/reference/remap/functions/parse_int.cue

@@ -30,7 +30,7 @@ remap: functions: parse_int: {
 		"The base is not between 2 and 36.",
 		"The number cannot be parsed in the base.",
 	]
-	return: types: ["string"]
+	return: types: ["integer"]
 
 	examples: [
 		{

website/cue/reference/remap/functions/slice.cue

@@ -32,7 +32,7 @@ remap: functions: slice: {
 		},
 	]
 	internal_failure_reasons: []
-	return: types: ["string"]
+	return: types: ["array", "string"]
 
 	examples: [
 		{