fix build error

Author: mairaw

xml/System.Buffers/StandardFormat.xml

@@ -140,7 +140,7 @@ Two <xref:System.Buffers.StandardFormat> instances are equal if their <xref:Syst
       </Parameters>
       <Docs>
         <param name="obj">An object to compare to the current instance.</param>
-        <summary>Returns a value that indicates whether a specified object is a <see cref="T:System.Buffers.StandardFormat"> object that is equal to the current instance.</summary>
+        <summary>Returns a value that indicates whether a specified object is a <see cref="T:System.Buffers.StandardFormat" /> object that is equal to the current instance.</summary>
         <returns><see langword="true" /> if the two instances are equal; otherwise, <see langword="false" />.</returns>
        <remarks>  
           <format type="text/markdown"><![CDATA[