Update doc references to ninja to also mention autoninja.

Change-Id: Ib45d3f86a0b68f6d0b10847cf7e3859b640e34a3
Reviewed-on: https://chromium-review.googlesource.com/c/1292403
Commit-Queue: Dirk Pranke <[email protected]>
Reviewed-by: Bruce Dawson <[email protected]>
Cr-Commit-Position: refs/heads/master@{#602453}
diff --git a/docs/linux_build_instructions.md b/docs/linux_build_instructions.md
index 1d5048c..444c9ffe 100644
--- a/docs/linux_build_instructions.md
+++ b/docs/linux_build_instructions.md
@@ -242,8 +242,8 @@
 $ autoninja -C out/Default chrome
 ```
 
-`autoninja` is a wrapper that automatically provides optimal values for the
-arguments passed to `ninja`.
+(`autoninja` is a wrapper that automatically provides optimal values for the
+arguments passed to `ninja`.)
 
 You can get a list of all of the other build targets from GN by running `gn ls
 out/Default` from the command line. To compile one, pass the GN label to Ninja