[docs] Remove extraneous backslash (#99802) (#99804)

Co-authored-by: Domenico Andreoli <[email protected]>

docs/developer/contributing/development-functional-tests.asciidoc

@@ -140,7 +140,7 @@ export default function (/* { providerAPI } */) {
 -----------
 
 **Services**:::
-Services are named singleton values produced by a Service Provider. Tests and other services can retrieve service instances by asking for them by name. All functionality except the mocha API is exposed via services.\
+Services are named singleton values produced by a Service Provider. Tests and other services can retrieve service instances by asking for them by name. All functionality except the mocha API is exposed via services.
 
 **Page objects**:::
 Page objects are a special type of service that encapsulate behaviors common to a particular page or plugin. When you write your own plugin, you’ll likely want to add a page object (or several) that describes the common interactions your tests need to execute.