doc: fix broken link in static-analysis.md

Fix broken link in `doc/contributing/static-analysis.md`.
Add a link to the main Node.js Coverity Scan project page.

Author: richardlau

doc/contributing/static-analysis.md

@@ -3,14 +3,17 @@
 The project uses Coverity to scan Node.js source code and to report potential
 issues in the C/C++ code base.
 
-Those who have been added to the Node.js coverity project can receive emails
+Those who have been added to the [Node.js coverity project][] can receive emails
 when there are new issues reported as well as view all current issues
-through <https://scan9.coverity.com/reports.htm>.
+through <https://scan9.scan.coverity.com/reports.htm>.
 
 Any collaborator can ask to be added to the Node.js coverity project
-by opening an issue in the [build](https://github.com/nodejs/build) repository
-titled `Please add me to coverity`. A member of the build WG with admin
-access will verify that the requestor is an existing collaborator as listed in
-the [collaborators section](https://github.com/nodejs/node#collaborators)
-on the nodejs/node project repo. Once validated the requestor will added
-to the coverity project.
+by opening an issue in the [build][] repository titled
+`Please add me to coverity`. A member of the build WG with admin access will
+verify that the requestor is an existing collaborator as listed in the
+[collaborators section][] on the nodejs/node project repo. Once validated the
+requestor will be added to the coverity project.
+
+[Node.js coverity project]: https://scan.coverity.com/projects/node-js
+[build]: https://github.com/nodejs/build
+[collaborators section]: https://github.com/nodejs/node#collaborators