Update README.adoc

Closes gh-5557

README.adoc

@@ -64,7 +64,7 @@ Having trouble with Spring Boot? We'd like to help!
 * Learn the Spring basics -- Spring Boot builds on many other Spring projects, check
   the http://spring.io[spring.io] web-site for a wealth of reference documentation. If
   you are just starting out with Spring, try one of the http://spring.io/guides[guides].
-* Ask a questions - we monitor http://stackoverflow.com[stackoverflow.com] for questions
+* Ask a question - we monitor http://stackoverflow.com[stackoverflow.com] for questions
   tagged with http://stackoverflow.com/tags/spring-boot[`spring-boot`].
 * Report bugs with Spring Boot at https://github.com/spring-projects/spring-boot/issues[github.com/spring-projects/spring-boot/issues].
 
@@ -114,12 +114,12 @@ is automatically set if you use the maven wrapper.
 _Also see link:CONTRIBUTING.adoc[CONTRIBUTING.adoc] if you wish to submit pull requests,
 and in particular please fill out the
 https://support.springsource.com/spring_committer_signup[Contributor's Agreement]
-before your first change however trivial. (Or if you filed such an agreement already for
+before your first change, however trivial. (Or if you filed such an agreement already for
 another project just mention that in your pull request.)_
 
 === Building reference documentation
 
-The reference documentation requires the documentation of the maven plugin to be
+The reference documentation requires the documentation of the Maven plugin to be
 available so you need to build that first since it's not generated by default.
 
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