Fix typo in README

protoc-artifacts/README.md

@@ -30,7 +30,7 @@ $ mvn install
 
 ## Cross-compilation
 The Maven script will try to detect the OS and the architecture from Java
-system properties. It's possible to build a protoc binary for an arhitecture
+system properties. It's possible to build a protoc binary for an architecture
 that is different from what Java has detected, as long as you have the proper
 compilers installed. For example, MingGW32 only ships with 32-bit compilers,
 but you can still build 32-bit protoc under a 64-bit system, with the following
@@ -42,7 +42,7 @@ $ mvn install -Dos.detected.arch=x86_32
 ## To push artifacts to Maven Central
 Before you can upload artifacts to Maven Central repository, make sure you have
 read [this page](http://central.sonatype.org/pages/apache-maven.html) on how to
-configure GPG and Sonatype account
+configure GPG and Sonatype account.
 
 Use the following command to upload artifacts:
 ```