Make conversion mechanism plural

Fixing typo for the "mechanism" word and improving readability by
adding ".".

See gh-41244

Author: mateusscheper

spring-boot-project/spring-boot-docs/src/docs/asciidoc/application-properties.adoc

@@ -8,7 +8,7 @@ include::attributes.adoc[]
 Various properties can be specified inside your `application.properties` file, inside your `application.yaml` file, or as command line switches.
 This appendix provides a list of common Spring Boot properties and references to the underlying classes that consume them.
 
-TIP: Spring Boot provides various conversion mechanism with advanced value formatting, make sure to review <<features#features.external-config.typesafe-configuration-properties.conversion, the properties conversion section>>.
+TIP: Spring Boot provides various conversion mechanisms with advanced value formatting. Make sure to review <<features#features.external-config.typesafe-configuration-properties.conversion, the properties conversion section>>.
 
 NOTE: Property contributions can come from additional jar files on your classpath, so you should not consider this an exhaustive list.
 Also, you can define your own properties.