Fix formatting issue in OrderedDictionary<TKey,TValue> documentation

Merged two separate <para> tags into one to fix formatting issue where a single sentence was incorrectly split across two paragraphs. The sentence now correctly reads as one continuous paragraph in the documentation.

Fixes lines 82-83 in OrderedDictionary`2.xml

Co-authored-by: jeffhandley <[email protected]>

Author: Copilot

xml/System.Collections.Generic/OrderedDictionary`2.xml

@@ -79,8 +79,7 @@
     <typeparam name="TValue">The type of the values in the dictionary.</typeparam>
     <summary>Represents a collection of key/value pairs that are accessible by the key or index.</summary>
     <remarks>
-      <para>Operations on the collection have algorithmic complexities that are similar to that of the <see cref="T:System.Collections.Generic.List`1" /></para>
-      <para>class, except with lookups by key similar in complexity to that of <see cref="T:System.Collections.Generic.Dictionary`2" />.</para>
+      <para>Operations on the collection have algorithmic complexities that are similar to that of the <see cref="T:System.Collections.Generic.List`1" /> class, except with lookups by key similar in complexity to that of <see cref="T:System.Collections.Generic.Dictionary`2" />.</para>
     </remarks>
   </Docs>
   <Members>