Use target="_blank" for module-info JavaDoc links

javadoc.io does not allow loading external sites in the
iframe from anchor links. Use the HTML 
target="_blank" flag to force links to open in a new tab
for the Maven Central and GitHub links to work around
this issue.

Signed-off-by: ascopes <[email protected]>

Author: ascopes

java-compiler-testing/src/main/java/module-info.java

@@ -43,10 +43,10 @@
  * code rather than flaky test environments and dependency management.</p>
  *
  * <p>Any questions, feedback, or issues can be submitted
- * <a href="https://github.com/ascopes/java-compiler-testing">on GitHub</a>.
+ * <a target="_blank" href="https://github.com/ascopes/java-compiler-testing">on GitHub</a>.
  *
  * <p>Releases can be found on
- * <a href="https://repo1.maven.org/maven2/io/github/ascopes/jct/java-compiler-testing/">
+ * <a target="_blank" href="https://repo1.maven.org/maven2/io/github/ascopes/jct/java-compiler-testing/">
  * Maven Central</a>.
  *
  * <pre><code>