Fix typo

See gh-30118

spring-boot-project/spring-boot-docs/src/docs/asciidoc/features/external-config.adoc

@@ -123,7 +123,7 @@ For example, to look for `myproject.properties` and `myproject.yaml` files you c
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 You can also refer to an explicit location by using the configprop:spring.config.location[] environment property.
-This properties accepts a comma-separated list of one or more locations to check.
+This property accepts a comma-separated list of one or more locations to check.
 
 The following example shows how to specify two distinct files: