fix parallel build of docs.json and docs-prerelease.json

- both targets wrote to the same temporary file list
Add "search" link to bug statistics page
Fix template alias parameter of type name example

Didn't make any sense before. I assume this is what was meant; it compiles and demonstrates the point.
Merge pull request #522 from John-Colvin/patch-5

Fix template alias parameter of type name example
Merge pull request #520 from JakobOvrum/bugsearch

Add "search" link to bug statistics page
Merge pull request #519 from MartinNowak/fixParallelBuild

fix parallel build of docs.json and docs-prerelease.json
Remove sed rule in wake of https://github.com/D-Programming-Language/druntime/pull/737