Making Example 4 more precise. Format fix 2.

Author: sethvs

reference/4.0/Microsoft.PowerShell.Management/Rename-Item.md

@@ -97,7 +97,7 @@ Because the Replace operator works with regular expressions, the dot preceding "
 To ensure that it matches only a dot (.), it is escaped with a backslash character (\\).
 The backslash character is not required in ".log" because it is a string, not a regular expression.
 
-To make sure that .txt is an extension, i.e. last part of the string representing the name, a dollar sign ($) is added after \.txt.
+To make sure that .txt is an extension, i.e. last part of the string representing the name, a dollar sign ($) is added after \\.txt.
 
 ## PARAMETERS