Update ImmutableMetadata.cs

Updated document comments to reflect the conversions between int and double.

Author: lager95

src/OpenFeature/Model/ImmutableMetadata.cs

@@ -42,7 +42,7 @@ public ImmutableMetadata(Dictionary<string, object> metadata)
     /// Gets the integer value associated with the specified key.
     /// </summary>
     /// <param name="key">The key of the value to retrieve.</param>
-    /// <returns>The integer value associated with the key, or null if the key is not found.</returns>
+    /// <returns>The value associated with the key as an integer, if it is of type double or int; otherwise, null.</returns>
     public int? GetInt(string key)
     {
         var hasValue = this._metadata.TryGetValue(key, out var value);
@@ -58,7 +58,7 @@ public ImmutableMetadata(Dictionary<string, object> metadata)
     /// Gets the double value associated with the specified key.
     /// </summary>
     /// <param name="key">The key of the value to retrieve.</param>
-    /// <returns>The double value associated with the key, or null if the key is not found.</returns>
+    /// <returns>The value associated with the key as a double, if it is of type double or int; otherwise, null.</returns>
     public double? GetDouble(string key)
     {
         var hasValue = this._metadata.TryGetValue(key, out var value);