Updated benchmark ownership documentaion to include documantation_url field.

Change-Id: I29978aa75fe2a71490cdcb1fcc78e47ac672f185
Reviewed-on: https://chromium-review.googlesource.com/1141094Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#575801}

docs/speed/benchmark/benchmark_ownership.md

@@ -21,10 +21,13 @@ There can be multiple owners of a benchmark, for example if there are multiple t
   ```
   @benchmark.Info(
       emails=['owner1@chromium.org', 'owner2@samsung.com'],
-      component=’GoatTeleporter>Performance’)
+      component=’GoatTeleporter>Performance’,
+      documentation_url='http://link.to/your_benchmark_documentation')
   ```
 
-  In this example, there are two owners for the benchmark, specified by email, and a bug component (we are working on getting the bug component automatically added to all perf regressions in Q2 2018).
+  In this example, there are two owners for the benchmark, specified by email; a bug component,
+  which will be automatically added to the bug by the perf dashboard; and a link
+  to documentation (which will be added to regression bugs in Q3 2018).
 
 1. Run `tools/perf/generate_perf_data` to update `tools/perf/benchmarks.csv`.
 1. Upload the benchmark python file and `benchmarks.csv` to a CL for review. Please add any previous owners to the review.