Replace insensitive language (submaster, MASTER_INVITE_ACCEPT and MASTER_INVITE_REJECT) (#907)

Author: mwwoda

CHANGELOG.md

@@ -5,6 +5,7 @@
 __Breaking Changes:__
 
 __New Features and Enhancements:__
+- Replace `submaster` GroupMembershipRole with `coadmin`. Replace `MASTER_INVITE_ACCEPT` and `MASTER_INVITE_REJECT` with `ADMIN_INVITE_ACCEPT` and `ADMIN_INVITE_REJECT`. ([#907](https://github.com/box/box-java-sdk/pull/907))
 - Add `tracking_codes` to create User API call ([#910](https://github.com/box/box-java-sdk/pull/910))
 
 __Bug Fixes:__

doc/groups.md

@@ -130,7 +130,7 @@ Create Membership
 
 Membership for the group can be created by calling the
 [`addMembership(BoxUser user)`][add-membership] and
-[`addMembership(BoxUser user, BoxGroupMembership.Role role)`][add-membership2] methods.
+[`addMembership(BoxUser user, BoxGroupMembership.GroupRole role)`][add-membership2] methods.
 
 <!-- sample post_group_memberships -->
 ```java
@@ -140,7 +140,7 @@ BoxGroupMembership.Info groupMembershipInfo = group.addMembership(user);
 ```
 
 [add-membership]: http://opensource.box.com/box-java-sdk/javadoc/com/box/sdk/BoxGroup.html#addMembership-com.box.sdk.BoxUser-
-[add-membership2]: http://opensource.box.com/box-java-sdk/javadoc/com/box/sdk/BoxGroup.html#addMembership-com.box.sdk.BoxUser-com.box.sdk.BoxGroupMembership.Role-
+[add-membership2]: http://opensource.box.com/box-java-sdk/javadoc/com/box/sdk/BoxGroup.html#addMembership-com.box.sdk.BoxUser-com.box.sdk.BoxGroupMembership.GroupRole-
 
 Get Membership
 ---------------
@@ -165,7 +165,7 @@ A groups membership can be updated by calling the
 ```java
 BoxGroupMembership membership = new BoxGroupMembership(api, id);
 BoxGroupMembership.Info info = membership.new Info();
-info.setRole(BoxGroupMembership.Role.MEMBER);
+info.setGroupRole(BoxGroupMembership.GroupRole.MEMBER);
 membership.updateInfo(info);
 ```