Minor identity documentation change

Change-Id: Ib139f2376e70ebb7b5621cdad4da61c64c1f9246

Author: TerryHowe

doc/source/command-objects/project.rst

@@ -54,7 +54,7 @@ Create new project
 
     Return existing project
 
-    If the project already exist return the existing project data and do not fail.
+    If the project already exists return the existing project data and do not fail.
 
 .. _project_create-name:
 .. describe:: <name>

doc/source/command-objects/role.rst

@@ -78,7 +78,7 @@ Create new role
 
     Return existing role
 
-    If the role already exist return the existing role data and do not fail.
+    If the role already exists return the existing role data and do not fail.
 
 .. describe:: <name>