LibJS: Use "T m_foo; // [[Foo]]" style for all Temporal internal slots

Userland/Libraries/LibJS/Runtime/Temporal/Calendar.h

@@ -24,9 +24,7 @@ public:
 
 private:
     // 12.5 Properties of Temporal.Calendar Instances, https://tc39.es/proposal-temporal/#sec-properties-of-temporal-calendar-instances
-
-    // [[Identifier]]
-    String m_identifier;
+    String m_identifier; // [[Identifier]]
 };
 
 Calendar* create_temporal_calendar(GlobalObject&, String const& identifier, FunctionObject* new_target = nullptr);

Userland/Libraries/LibJS/Runtime/Temporal/Duration.h

@@ -31,7 +31,6 @@ public:
 
 private:
     // 7.4 Properties of Temporal.Duration Instances, https://tc39.es/proposal-temporal/#sec-properties-of-temporal-duration-instances
-
     double m_years;        // [[Years]]
     double m_months;       // [[Months]]
     double m_weeks;        // [[Weeks]]

Userland/Libraries/LibJS/Runtime/Temporal/Instant.h

@@ -26,9 +26,7 @@ private:
     virtual void visit_edges(Visitor&) override;
 
     // 8.4 Properties of Temporal.Instant Instances, https://tc39.es/proposal-temporal/#sec-properties-of-temporal-instant-instances
-
-    // [[Nanoseconds]]
-    BigInt& m_nanoseconds;
+    BigInt& m_nanoseconds; // [[Nanoseconds]]
 };
 
 // -86400 * 10^17

Userland/Libraries/LibJS/Runtime/Temporal/TimeZone.h

@@ -28,12 +28,8 @@ public:
 
 private:
     // 11.5 Properties of Temporal.TimeZone Instances, https://tc39.es/proposal-temporal/#sec-properties-of-temporal-timezone-instances
-
-    // [[Identifier]]
-    String m_identifier;
-
-    // [[OffsetNanoseconds]]
-    Optional<OffsetType> m_offset_nanoseconds;
+    String m_identifier;                       // [[Identifier]]
+    Optional<OffsetType> m_offset_nanoseconds; // [[OffsetNanoseconds]]
 };
 
 bool is_valid_time_zone_name(String const& time_zone);