Polish "Fix description of "logging.logback.rollingpolicy.max-history""

See gh-28448

Author: snicoll

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

@@ -2197,7 +2197,7 @@ The following rotation policy properties are supported:
 | The maximum amount of size log archives can take before being deleted.
 
 | configprop:logging.logback.rollingpolicy.max-history[]
-| The number of days to keep log archives (defaults to 7)
+| The maximum number of archive log files to keep (defaults to 7).
 |===