Fix grammar

Author: zohairawan

src/classes/field_access.md

@@ -1,6 +1,6 @@
 # Field Access
 
-You can access the value of any field on a class by writing the name of a variable holding an instance
+You can access the value of any field in a class by writing the name of a variable holding an instance
 of that class, `.`, then the name of that field.
 
 ```java

src/classes/field_initialization.md

@@ -2,7 +2,7 @@
 
 You can set an initial value for a field in a few ways.
 
-One is to access to assign the field directly on the instance created.
+One is to assign the field directly on the instance created.
 
 ```java
 class Muppet {