Add missing space (#8645)

Author: jozkee

xml/System.Diagnostics/ProcessModule.xml

@@ -61,7 +61,7 @@
     </Attribute>
   </Attributes>
   <Docs>
-    <summary>Represents a.dll or .exe file that is loaded into a particular process.</summary>
+    <summary>Represents a .dll or .exe file that is loaded into a particular process.</summary>
     <remarks>
       <format type="text/markdown"><![CDATA[