Add missing backtick in configurationProperties.adoc (#8819)

Author: aaabramov

src/main/docs/guide/config/configurationProperties.adoc

@@ -84,7 +84,7 @@ public class EngineConfig {
 <1> Micronaut will use an empty prefix for getters and setters.
 <2> Define the getters and setters with an empty prefix.
 
-Now you can inject `EngineConfig` and use it with `engineConfig.manufacturer()` and `engineConfig.cylinders() to retrieve the values from configuration.
+Now you can inject `EngineConfig` and use it with `engineConfig.manufacturer()` and `engineConfig.cylinders()` to retrieve the values from configuration.
 
 == Property Type Conversion