Correct description of file generated by heapdump endpoint

Closes gh-15016

Author: wilkinsona

spring-boot-project/spring-boot-docs/src/main/asciidoc/production-ready-features.adoc

@@ -148,7 +148,7 @@ use the following additional endpoints:
 | ID | Description | Enabled by default
 
 |`heapdump`
-|Returns a GZip compressed `hprof` heap dump file.
+|Returns an `hprof` heap dump file.
 |Yes
 
 |`jolokia`