Update documentation to reflect new test target (#2466)

* Update documentation to reflect new test target:
"make installcheck-good" -> "make installcheck-world"

README.md

@@ -158,7 +158,7 @@ DATADIRS=/tmp/gpdb-cluster MASTER_PORT=15432 PORT_BASE=25432 make cluster
 The TCP port for the regression test can be changed on the fly:
 
 ```
-PGPORT=15432 make installcheck-good
+PGPORT=15432 make installcheck-world
 ```
 
 
@@ -215,19 +215,24 @@ gpperfmon is dependent on several libraries like apr, apu, and libsigar
 * The default regression tests
 
 ```
-make installcheck-good
+make installcheck-world
 ```
 
+* The top-level target __installcheck-world__ will run all regression
+  tests in GPDB against the running cluster. For testing individual
+  parts, the respective targets can be run separately.
+
 * The PostgreSQL __check__ target does not work. Setting up a
   Greenplum cluster is more complicated than a single-node PostgreSQL
   installation, and no-one's done the work to have __make check__
   create a cluster. Create a cluster manually or use gpAux/gpdemo/
-  (example below) and run __make installcheck-good__ against
-  that. Patches are welcome!
+  (example below) and run the toplevel __make installcheck-world__
+  against that. Patches are welcome!
 
 * The PostgreSQL __installcheck__ target does not work either, because
   some tests are known to fail with Greenplum. The
-  __installcheck-good__ schedule excludes those tests.
+  __installcheck-good__ schedule in __src/test/regress__ excludes those
+  tests.
 
 * When adding a new test, please add it to one of the GPDB-specific tests,
   in greenplum_schedule, rather than the PostgreSQL tests inherited from the
@@ -244,7 +249,7 @@ image is currently under heavy development.
 A quickstart guide to Docker can be found on the [Pivotal Engineering Journal](http://engineering.pivotal.io/post/docker-gpdb/).
 
 Known issues:
-* The `installcheck-good` make target has at least 4 failures, some of which
+* The `installcheck-world` make target has at least 4 failures, some of which
   are non-deterministic
 
 ### Running regression tests with Docker
@@ -270,11 +275,11 @@ Known issues:
     docker run -it beefc4f3
     ```
 
-1. As `gpadmin` user run `installcheck-good`
+1. As `gpadmin` user run `installcheck-world`
     ```bash
     su gpadmin
     cd /workspace/gpdb
-    make installcheck-good
+    make installcheck-world
     ```
 
 ### Caveats

src/tools/vagrant/README.md

@@ -110,7 +110,7 @@ psql
 To run the tests:
 ```shell
 cd ~/gpdb
-make installcheck-good
+make installcheck-world
 ```
 
 If you are curious how this happened, take a look at the following scripts: