Fix asciidoc ref warnings by escaping

Author: jvalkeal

docs/modules/ROOT/pages/ref/actionfile/action-guide.adoc

@@ -28,7 +28,7 @@ actions:
       text: Hello {{user-name}} on {{os-name}}.
 ```
 
-The `{{user-name}}` and `{{os-name}}` variables are replaced with actual values by the Handlebars template engine.
+The `{\{user-name}}` and `{\{os-name}}` variables are replaced with actual values by the Handlebars template engine.
 Command line options passed to user-defined command are exposed as variables to be used by the template engine.
 
 For more information on predefined template engine variables, see the xref:ref/usercommand/user-command-guide.adoc#_template_engine[Template Engine] section.

docs/modules/ROOT/pages/ref/actionfile/roles-guide.adoc

@@ -126,9 +126,9 @@ The generated file contains:
 Hello Mondo on Linux.  Italian
 ----
 
-The value of `{{greeting}}` comes from the role variable because it was not provided as a command-line option.
+The value of `{\{greeting}}` comes from the role variable because it was not provided as a command-line option.
 
-The `{{language}}` variable was not a command line option, but it is available to use with Handlebars expressions.
+The `{\{language}}` variable was not a command line option, but it is available to use with Handlebars expressions.
 
 Now we can remove the generated file. in the interactive shell, we run `. ! rm hello.txt` and pass in the `greeting` command line option:
 

docs/modules/ROOT/pages/ref/usercommand/user-command-guide.adoc

@@ -192,27 +192,27 @@ In the previous example, the `{{capitalizeFirst feature}}` template variable is
 
 By default, several system variables are exposed to the template engine:
 
-* `System.getProperties()` is available as `{{system-properties}}`
-* `System.getenv()` is available as `{{system-environment}}`
-* The current time (defined by `new Date().toString()`) is available as `{{now}}`
-* The `java.io.tmpdir` system property is available as `{{tmp-dir}}`
-* The `file.separator` system property is available as `{{file-separator}}`* The `os.name` system property is available as `{{os-name}}`
-* The `user.name` system property is available as `{{user.name}}`
+* `System.getProperties()` is available as `{\{system-properties}}`
+* `System.getenv()` is available as `{\{system-environment}}`
+* The current time (defined by `new Date().toString()`) is available as `{\{now}}`
+* The `java.io.tmpdir` system property is available as `{\{tmp-dir}}`
+* The `file.separator` system property is available as `{\{file-separator}}`* The `os.name` system property is available as `{\{os-name}}`
+* The `user.name` system property is available as `{\{user.name}}`
 
-The Java package name where the Spring Boot main application class resides is available as `{{root-package}}`.
+The Java package name where the Spring Boot main application class resides is available as `{\{root-package}}`.
 
-The directory where the Spring Boot main application class resides is available as `{{root-package-dir}}`.
+The directory where the Spring Boot main application class resides is available as `{\{root-package-dir}}`.
 
 The Maven model also exposes several variables:
 
-* `{{artifact-id}}`
-* `{{artifact-version}}`
-* `{{artifact-path}}`
-* `{{project-name}}`
-* `{{project-descriptoin}}`
-* `{{maven-model}` - This is the https://maven.apache.org/ref/3.9.0/maven-model/apidocs/org/apache/maven/model/Model.html[org.apache.maven.model.Model] class.
-* `{{maven-properties}}` - This is a Java properties object that has, as keys, the values of each entry in the POM's `<properties>` section.
-* `{{java-version}}` - This looks for a Maven Property named `java.version` in the POM. If the value is `1.8`, it is converted to a value of `8`.
+* `{\{artifact-id}}`
+* `{\{artifact-version}}`
+* `{\{artifact-path}}`
+* `{\{project-name}}`
+* `{\{project-descriptoin}}`
+* `{\{maven-model}}` - This is the https://maven.apache.org/ref/3.9.0/maven-model/apidocs/org/apache/maven/model/Model.html[org.apache.maven.model.Model] class.
+* `{\{maven-properties}}` - This is a Java properties object that has, as keys, the values of each entry in the POM's `<properties>` section.
+* `{\{java-version}}` - This looks for a Maven Property named `java.version` in the POM. If the value is `1.8`, it is converted to a value of `8`.
 
 == Creating a New User-defined Command