8331331: :tier1 target explanation in doc/testing.md is incorrect

Reviewed-by: erikj, dholmes, ihse

Author: SendaoYan

doc/testing.html

@@ -179,8 +179,9 @@ <h2 id="test-selection">Test selection</h2>
 <p>The test specifications given in <code>TEST</code> is parsed into
 fully qualified test descriptors, which clearly and unambigously show
 which tests will be run. As an example, <code>:tier1</code> will expand
-to
-<code>jtreg:$(TOPDIR)/test/hotspot/jtreg:tier1 jtreg:$(TOPDIR)/test/jdk:tier1 jtreg:$(TOPDIR)/test/langtools:tier1 jtreg:$(TOPDIR)/test/nashorn:tier1 jtreg:$(TOPDIR)/test/jaxp:tier1</code>.
+to include all subcomponent test directories that define `tier1`,
+for example:
+<code>jtreg:$(TOPDIR)/test/hotspot/jtreg:tier1 jtreg:$(TOPDIR)/test/jdk:tier1 jtreg:$(TOPDIR)/test/langtools:tier1 ...</code>.
 You can always submit a list of fully qualified test descriptors in the
 <code>TEST</code> variable if you want to shortcut the parser.</p>
 <h3 id="common-test-groups">Common Test Groups</h3>

doc/testing.md

@@ -103,11 +103,11 @@ test runs, the `test TEST="x"` solution needs to be used.
 
 The test specifications given in `TEST` is parsed into fully qualified test
 descriptors, which clearly and unambigously show which tests will be run. As an
-example, `:tier1` will expand to `jtreg:$(TOPDIR)/test/hotspot/jtreg:tier1
-jtreg:$(TOPDIR)/test/jdk:tier1 jtreg:$(TOPDIR)/test/langtools:tier1
-jtreg:$(TOPDIR)/test/nashorn:tier1 jtreg:$(TOPDIR)/test/jaxp:tier1`. You can
-always submit a list of fully qualified test descriptors in the `TEST` variable
-if you want to shortcut the parser.
+example, `:tier1` will expand to include all subcomponent test directories
+that define `tier1`, for example: `jtreg:$(TOPDIR)/test/hotspot/jtreg:tier1
+jtreg:$(TOPDIR)/test/jdk:tier1 jtreg:$(TOPDIR)/test/langtools:tier1 ...`. You
+can always submit a list of fully qualified test descriptors in the `TEST`
+variable if you want to shortcut the parser.
 
 ### Common Test Groups