[Docs] fixes

Stylistic and other fixes

[email protected]
BUG=524256

Review URL: https://codereview.chromium.org/1318153003

Cr-Commit-Position: refs/heads/master@{#346569}
diff --git a/docs/linux_cert_management.md b/docs/linux_cert_management.md
index 7c75acf..bfc06277 100644
--- a/docs/linux_cert_management.md
+++ b/docs/linux_cert_management.md
@@ -1,8 +1,10 @@
 # Linux Cert Management
 
+*** note
 **NOTE:** SSL client authentication with personal certificates does not work
 completely in Linux, see [issue 16830](https://crbug.com/16830) and
 [issue 25241](https://crbug.com/25241).
+***
 
 The easy way to manage certificates is navigate to chrome://settings/search#ssl.
 Then click on the "Manage Certificates" button. This will load a built-in