Fix formatting error in documentation

Fixes gh-3279

docs/manual/src/docs/asciidoc/index.adoc

@@ -2496,7 +2496,7 @@ When using `DelegatingFilterProxy`, you will see something like this in the `web
 </filter-mapping>
 ----
 
-Notice that the filter is actually a `DelegatingFilterProxy`, and not the class that will actually implement the logic of the filter. What `DelegatingFilterProxy` does is delegate the `Filter` methods through to a bean which is obtained from the Spring application context. This enables the bean to benefit from the Spring web application context lifecycle support and configuration flexibility. The bean must implement `javax.servlet.Filter` and it must have the same name as that in the `filter-name` element. Read the Javadoc for `DelegatingFilterProxy` for more information
+Notice that the filter is actually a `DelegatingFilterProxy`, and not the class that will actually implement the logic of the filter. What `DelegatingFilterProxy` does is delegate the `Filter` 's methods through to a bean which is obtained from the Spring application context. This enables the bean to benefit from the Spring web application context lifecycle support and configuration flexibility. The bean must implement `javax.servlet.Filter` and it must have the same name as that in the `filter-name` element. Read the Javadoc for `DelegatingFilterProxy` for more information
 
 
 [[filter-chain-proxy]]