Work around asciidoctor handling of nested ` and *

In asciidoctor, the markup

	`refs/heads/foo/*` for
	[...]
	`refs/heads/sandbox/${username}/*`. If you do,

renders as

	<code>refs/heads/foo/<strong></code> for
	[...]
	<code>refs/heads/sandbox/${username}/</strong></code>. If you do,

which is problematic in a few ways:

 - it is invalid HTML
 - the asterisks are swallowed
 - a section of unrelated text is made bold

Since asciidoc 8.4.1, by contrast, backticks introduce an inline literal
inside which markup is not interpreted (see git.git commit v1.7.10.3~16^2,
"docs: stop using asciidoc no-inline-literal", 2012-04-26).  We can
emulate that behavior in asciidoctor by explicitly introducing inline
literal context using '+'.

https://github.com/asciidoctor/asciidoctor/issues/718 has more details.

Change-Id: Iab31e33f92929a1ce824919b1cdfc93aeb0581a9
diff --git a/Documentation/user-dashboards.txt b/Documentation/user-dashboards.txt
index 52916b9..f6db6cf 100644
--- a/Documentation/user-dashboards.txt
+++ b/Documentation/user-dashboards.txt
@@ -58,7 +58,7 @@
 == Project Dashboards
 
 It is possible to share custom dashboards at a project level. To do
-this define the dashboards in a `refs/meta/dashboards/*` branch of the
+this define the dashboards in a `+refs/meta/dashboards/*+` branch of the
 project. For each dashboard create a config file. The file path/name
 will be used as name (equivalent to a title in a custom dashboard) for
 the dashboard.