LibJS: Make section URLs more consistent

- Drop index.html
- Include trailing slash before anchor
- Don't use multipage spec URLs

Userland/Libraries/LibJS/Runtime/ArrayPrototype.cpp

@@ -80,7 +80,7 @@ void ArrayPrototype::initialize(GlobalObject& global_object)
     define_direct_property(*vm.well_known_symbol_iterator(), get_without_side_effects(vm.names.values), attr);
 
     // 23.1.3.35 Array.prototype [ @@unscopables ], https://tc39.es/ecma262/#sec-array.prototype-@@unscopables
-    // With proposal, https://tc39.es/proposal-array-find-from-last/index.html#sec-array.prototype-@@unscopables
+    // With proposal, https://tc39.es/proposal-array-find-from-last/#sec-array.prototype-@@unscopables
     auto* unscopable_list = Object::create(global_object, nullptr);
     MUST(unscopable_list->create_data_property_or_throw(vm.names.at, Value(true)));
     MUST(unscopable_list->create_data_property_or_throw(vm.names.copyWithin, Value(true)));
@@ -1174,7 +1174,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::find_index)
     return Value(-1);
 }
 
-// 1 Array.prototype.findLast ( predicate [ , thisArg ] ), https://tc39.es/proposal-array-find-from-last/index.html#sec-array.prototype.findlast
+// 1 Array.prototype.findLast ( predicate [ , thisArg ] ), https://tc39.es/proposal-array-find-from-last/#sec-array.prototype.findlast
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::find_last)
 {
     auto predicate = vm.argument(0);
@@ -1213,7 +1213,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::find_last)
     return js_undefined();
 }
 
-// 2 Array.prototype.findLastIndex ( predicate [ , thisArg ] ), https://tc39.es/proposal-array-find-from-last/index.html#sec-array.prototype.findlastindex
+// 2 Array.prototype.findLastIndex ( predicate [ , thisArg ] ), https://tc39.es/proposal-array-find-from-last/#sec-array.prototype.findlastindex
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::find_last_index)
 {
     auto predicate = vm.argument(0);
@@ -1342,7 +1342,7 @@ JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::every)
     return Value(true);
 }
 
-// 23.1.3.29 Array.prototype.splice ( start, deleteCount, ...items ), https://tc39.es/ecma262#sec-array.prototype.splice
+// 23.1.3.29 Array.prototype.splice ( start, deleteCount, ...items ), https://tc39.es/ecma262/#sec-array.prototype.splice
 JS_DEFINE_NATIVE_FUNCTION(ArrayPrototype::splice)
 {
     auto* this_object = TRY(vm.this_value(global_object).to_object(global_object));

Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp

@@ -282,7 +282,7 @@ JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::find_index)
     return Value(result_index);
 }
 
-// 4 %TypedArray%.prototype.findLast ( predicate [ , thisArg ] ), https://tc39.es/proposal-array-find-from-last/index.html#sec-%typedarray%.prototype.findlast
+// 4 %TypedArray%.prototype.findLast ( predicate [ , thisArg ] ), https://tc39.es/proposal-array-find-from-last/#sec-%typedarray%.prototype.findlast
 JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::find_last)
 {
     auto result = js_undefined();
@@ -296,7 +296,7 @@ JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::find_last)
     return result;
 }
 
-// 5 %TypedArray%.prototype.findLastIndex ( predicate [ , thisArg ] ), https://tc39.es/proposal-array-find-from-last/index.html#sec-%typedarray%.prototype.findlastindex
+// 5 %TypedArray%.prototype.findLastIndex ( predicate [ , thisArg ] ), https://tc39.es/proposal-array-find-from-last/#sec-%typedarray%.prototype.findlastindex
 JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::find_last_index)
 {
     auto result_index = -1;

Userland/Libraries/LibJS/Runtime/Value.cpp

@@ -539,14 +539,14 @@ ThrowCompletionOr<BigInt*> Value::to_bigint(GlobalObject& global_object) const
     }
 }
 
-// 7.1.15 ToBigInt64 ( argument ), https://tc39.es/ecma262/multipage/abstract-operations.html#sec-tobigint64
+// 7.1.15 ToBigInt64 ( argument ), https://tc39.es/ecma262/#sec-tobigint64
 ThrowCompletionOr<i64> Value::to_bigint_int64(GlobalObject& global_object) const
 {
     auto* bigint = TRY(to_bigint(global_object));
     return static_cast<i64>(bigint->big_integer().to_u64());
 }
 
-// 7.1.16 ToBigUint64 ( argument ), https://tc39.es/ecma262/multipage/abstract-operations.html#sec-tobiguint64
+// 7.1.16 ToBigUint64 ( argument ), https://tc39.es/ecma262/#sec-tobiguint64
 ThrowCompletionOr<u64> Value::to_bigint_uint64(GlobalObject& global_object) const
 {
     auto* bigint = TRY(to_bigint(global_object));

Userland/Libraries/LibJS/Token.cpp

@@ -204,7 +204,7 @@ String Token::string_value(StringValueStatus& status) const
     return builder.to_string();
 }
 
-// 12.8.6.2 Static Semantics: TRV, https://tc39.es/ecma262/multipage/ecmascript-language-lexical-grammar.html#sec-static-semantics-trv
+// 12.8.6.2 Static Semantics: TRV, https://tc39.es/ecma262/#sec-static-semantics-trv
 String Token::raw_template_value() const
 {
     return value().replace("\r\n", "\n", true).replace("\r", "\n", true);