Java: Avoid reference to other diagnostics

Author: henrymercer

java/ql/integration-tests/all-platforms/java/diagnostics/multiple-candidate-builds/diagnostics.expected

@@ -13,7 +13,7 @@
   }
 }
 {
-  "markdownMessage": "If you want to use one of the candidate build systems and directories (see previous warnings), [supply a manual a build command](https://docs.github.com/en/github-ae@latest/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-the-codeql-workflow-for-compiled-languages#adding-build-steps-for-a-compiled-language).",
+  "markdownMessage": "Could not identify a unique top-level project to build. [Supply a manual build command](https://docs.github.com/en/github-ae@latest/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-the-codeql-workflow-for-compiled-languages#adding-build-steps-for-a-compiled-language).",
   "severity": "error",
   "source": {
     "extractorName": "java",