Improve docs

src/csharp/Grpc.Core.Api/Metadata.cs

@@ -76,7 +76,7 @@ namespace Grpc.Core
         }
 
         /// <summary>
-        /// Gets the last metadata entry with the specified key. If no entries have the key then <c>null</c> is returned.
+        /// Gets the last metadata entry with the specified key. If there are no matching entries then <c>null</c> is returned.
         /// </summary>
         public Entry Get(string key)
         {
@@ -92,33 +92,33 @@ namespace Grpc.Core
         }
 
         /// <summary>
-        /// Gets all metadata entries with the specified key.
+        /// Gets the string value of the last metadata entry with the specified key. If there are no matching entries then <c>null</c> is returned.
         /// </summary>
-        public IEnumerable<Entry> GetAll(string key)
-        {
-            for (int i = 0; i < entries.Count; i++)
-            {
-                if (entries[i].Key == key)
+        public string GetValue(string key)
         {
-                    yield return entries[i];
-                }
-            }
+            return Get(key)?.Value;
         }
 
         /// <summary>
-        /// Gets the last metadata entry string value with the specified key. If no entries have the key then <c>null</c> is returned.
+        /// Gets the bytes value of the last metadata entry with the specified key. If there are no matching entries then <c>null</c> is returned.
         /// </summary>
-        public string GetValue(string key)
+        public byte[] GetValueBytes(string key)
         {
-            return Get(key)?.Value;
+            return Get(key)?.ValueBytes;
         }
 
         /// <summary>
-        /// Gets the last metadata entry bytes value with the specified key. If no entries have the key then <c>null</c> is returned.
+        /// Gets all metadata entries with the specified key.
         /// </summary>
-        public byte[] GetValueBytes(string key)
+        public IEnumerable<Entry> GetAll(string key)
         {
-            return Get(key)?.ValueBytes;
+            for (int i = 0; i < entries.Count; i++)
+            {
+                if (entries[i].Key == key)
+                {
+                    yield return entries[i];
+                }
+            }
         }
 
         /// <summary>