Fix typo in buildSrc/README.md

See spring-projectsgh-24697

Author: chenqimiao

buildSrc/README.md

@@ -7,7 +7,7 @@ They are declared in the `build.gradle` file in this folder.
 
 ### Compiler conventions
 
-The `org.springframework.build.compile` plubin applies the Java compiler conventions to the build.
+The `org.springframework.build.compile` plugin applies the Java compiler conventions to the build.
 By default, the build compiles sources with Java `1.8` source and target compatibility.
 You can test a different source compatibility version on the CLI with a project property like: