L89834: Removing extra space (#2509)

Localization team has reported source content issue that causes localized version to have broken/different format compared to en-us version.

Author: v-makoud

xml/System.Reflection.Metadata/NamespaceDefinition.xml

@@ -99,8 +99,7 @@
         <summary>Gets the namespace definitions that are direct children of the current namespace definition.</summary>
         <value>An immutable array of namespace definitions that are direct children of the current namespace definition.</value>
         <remarks>
-          <format type="text/markdown">
-  <![CDATA[
+          <format type="text/markdown"><![CDATA[
 ## Remarks
 
 For example: