Add link from APM Server to FIPS 8.19 (elastic#4923)

Author: karenzone

docs/en/observability/apm/security/index.asciidoc

@@ -29,6 +29,12 @@ You should approach securing your application data from different perspectives:
 
   Read more in <<apm-secure-comms-stack>>.
 
+| *Is FIPS compatibility available for APM Server?*
+| preview:[] 
+  Yes! FIPS compatible binaries are available for download. 
+  Look for the `Linux x86_64 (FIPS)` or `Linux aarch64 (FIPS)` platform option on the https://www.elastic.co/downloads/apm[APM Server download] page. 
+  Get more details about FIPS compatibility for APM Server and other ingest tools in {fleet-guide}/fips-ingest.html[FIPS mode for Ingest tools].
+
 | *Who can use the Applications UI?*
 | Use role-based access control to grant users access to features of the Applications UI.