Polish "Polish README"

See gh-450

Author: wilkinsona

README.adoc

@@ -292,7 +292,7 @@ Spring Framework manually formats code, whereas Spring Boot uses automatic forma
 === Indenting With Spaces
 By default, tabs are used for indenting formatted code.
 We strongly recommend that this default is not changed, especially for official Spring projects.
-If, however, you feel that you can't live with tabs, then switching to spaces is the one configuration option that we do support.
+If, however, you feel that you can't live with tabs, switching to spaces is the one configuration option that we do support.
 
 To use spaces rather than tabs, add a file called `.springjavaformatconfig` to the root of your project with the following content: