Enclose variables in back quote

docs/10.4-test-utils.md

@@ -49,7 +49,7 @@ Pass a mocked component module to this method to augment it with useful methods
 boolean isElement(ReactElement element)
 ```
 
-Returns true if `element` is any ReactElement.
+Returns `true` if `element` is any ReactElement.
 
 ### isElementOfType
 
@@ -57,7 +57,7 @@ Returns true if `element` is any ReactElement.
 boolean isElementOfType(ReactElement element, function componentClass)
 ```
 
-Returns true if `element` is a ReactElement whose type is of a React `componentClass`.
+Returns `true` if `element` is a ReactElement whose type is of a React `componentClass`.
 
 ### isDOMComponent
 
@@ -65,7 +65,7 @@ Returns true if `element` is a ReactElement whose type is of a React `componentC
 boolean isDOMComponent(ReactComponent instance)
 ```
 
-Returns true if `instance` is a DOM component (such as a `<div>` or `<span>`).
+Returns `true` if `instance` is a DOM component (such as a `<div>` or `<span>`).
 
 ### isCompositeComponent
 
@@ -73,7 +73,7 @@ Returns true if `instance` is a DOM component (such as a `<div>` or `<span>`).
 boolean isCompositeComponent(ReactComponent instance)`
 ```
 
-Returns true if `instance` is a composite component (created with `React.createClass()`).
+Returns `true` if `instance` is a composite component (created with `React.createClass()`).
 
 ### isCompositeComponentWithType
 
@@ -81,7 +81,7 @@ Returns true if `instance` is a composite component (created with `React.createC
 boolean isCompositeComponentWithType(ReactComponent instance, function componentClass)
 ```
 
-Returns true if `instance` is a composite component (created with `React.createClass()`) whose type is of a React `componentClass`.
+Returns `true` if `instance` is a composite component (created with `React.createClass()`) whose type is of a React `componentClass`.
 
 ### findAllInRenderedTree
 
@@ -89,7 +89,7 @@ Returns true if `instance` is a composite component (created with `React.createC
 array findAllInRenderedTree(ReactComponent tree, function test)
 ```
 
-Traverse all components in `tree` and accumulate all components where `test(component)` is true. This is not that useful on its own, but it's used as a primitive for other test utils.
+Traverse all components in `tree` and accumulate all components where `test(component)` is `true`. This is not that useful on its own, but it's used as a primitive for other test utils.
 
 ### scryRenderedDOMComponentsWithClass
 
@@ -160,7 +160,7 @@ Similar to `React.render`.
 ReactComponent shallowRenderer.getRenderOutput()
 ```
 
-After render has been called, returns shallowly rendered output. You can then begin to assert facts about the output. For example, if your component's render method returns:
+After `render` has been called, returns shallowly rendered output. You can then begin to assert facts about the output. For example, if your component's render method returns:
 
 ```javascript
 <div>