In Correctness Testing Doc, render --option correctly
Review URL: https://codereview.chromium.org/871993004
diff --git a/site/dev/contrib/testing.md b/site/dev/contrib/testing.md
index c2ee8ed..fb3d92d 100644
@@ -13,7 +13,7 @@
When you run this, you may notice your CPU peg to 100% for a while, then taper
off to 1 or 2 active cores as the run finishes. This is intentional. DM is
very multithreaded, but some of the work, particularly GPU-backed work, is
-still forced to run on a single thread. You can use --threads N to limit DM to
+still forced to run on a single thread. You can use `--threads N` to limit DM to
N threads if you like. This can sometimes be helpful on machines that have
relatively more CPU available than RAM.
@@ -56,12 +56,12 @@
DM has found 382 unit tests (code linked in from tests/), and 492 other drawing
sources. These drawing sources may be GM integration tests (code linked in
-from gm/), image files (from --images, which defaults to "resources") or .skp
-files (from --skps, which defaults to "skps"). You can control the types of
-sources DM will use with --src (default, "tests gm image skp").
+from gm/), image files (from `--images`, which defaults to "resources") or .skp
+files (from `--skps`, which defaults to "skps"). You can control the types of
+sources DM will use with `--src` (default, "tests gm image skp").
DM has found 3 usable ways to draw those 492 sources. This is controlled by
---config, which today defaults to "565 8888 gpu nonrendering angle nvprmsaa4".
+`--config`, which today defaults to "565 8888 gpu nonrendering angle nvprmsaa4".
DM has skipped nonrendering, angle, and nvprmssa4, leaving three usable configs:
565, 8888, and gpu. These three name different ways to draw using Skia:
@@ -121,7 +121,7 @@
-The directories are nested first by sink type (--config), then by source type (--src).
+The directories are nested first by sink type (`--config`), then by source type (`--src`).
The image from the task we just looked at, "8888 image mandrill_132x132_12x12.astc-5-subsets",
can be found at dm_output/8888/image/mandrill_132x132_12x12.astc-5-subsets.png.