Fix typos in README.md contributing section (#3087)

Author: pivovarit

README.md

@@ -56,7 +56,7 @@ See [User Guide](http://docs.vavr.io) and/or [Javadoc](http://www.javadoc.io/doc
 ### Contributing
 
 Currently, there are two significant branches:
-- `main` (represents a stream of work leading to the release of a new ma version)
-- `version/1.x` (historical work that went into `1.0.0-alpha-3`, treat is as read-only - will be kept around for cherry-picking)
+- `main` (represents a stream of work leading to the release of a new major version)
+- `version/1.x` (historical work that went into `1.0.0-alpha-3`, treat it as read-only - will be kept around for cherry-picking)
 
 A small number of users have reported problems building Vavr. Read our [contribution guide](./CONTRIBUTING.md) for details.