Only point to :leak-detection Leiningen profile for enabling

Since this should be the overwhelmingly common way to enable the detector, we don't need to explain
how to enable it manually. Looking at the profile itself should be sufficient to understand which
settings are needed. Also, this way there's less of a chance for the profile and the docstring to
diverge over time.

Also, provide more context in the init log in case the logger doesn't print the current namespace by
default.

Author: DerGuteMoritz

test/aleph/resource_leak_detector.clj

@@ -7,14 +7,7 @@
   intentional presence of leaks and to check for unintended leaks. The main API entry points for
   this are `with-leak-collection`, `with-expected-leaks` and `instrument-tests!`.
 
-  To enable it, pass `-Dio.netty.customResourceLeakDetector=aleph.resource_leak_detector` to the
-  JVM. You will also have to pass `-Dio.netty.leakDetection.level=PARANOID`.
-
-  Most reliable results are achieved by also passing the following options:
-  `-Dio.netty.leakDetection.targetRecords=1`
-  `-Dio.netty.allocator.type=unpooled`
-
-  All of the above is also provided by the `:leak-detection` Leiningen profile.
+  To enable it, use the `:leak-detection` Leiningen profile.
 
   NOTE: Currently only improves reliability for detecting leaked ByteBufs. Other types of leaked
   resources will still be detected but not with the same reliability. Search Netty's codebase for
@@ -58,7 +51,7 @@
                    "Enable Netty debug logging to diagnose the cause.")))
       (throw (RuntimeException.
               (str "Attempted to use `aleph.resource-leak-detector` API but it is not enabled. "
-                   "Pass `-Dio.netty.customResourceLeakDetector=aleph.resource_leak_detector` to enable.")))))
+                   "To enable it, use the `:leak-detection` Leiningen profile.")))))
   (when-not (= ResourceLeakDetector$Level/PARANOID (ResourceLeakDetector/getLevel))
     (throw (RuntimeException.
             (str "`aleph.resource_leak_detector` requires `-Dio.netty.leakDetection.level=PARANOID`. "
@@ -205,6 +198,6 @@
                  (alter-meta! tv update :test instrument-test-fn))))))
 
 (if (enabled?)
-  (log/info "enabled.")
-  (log/info "disabled. This means resource leaks will be reported less accurately."
-            "Pass `-Dio.netty.customResourceLeakDetector=aleph.resource_leak_detector` to enable."))
+  (log/info "aleph.resource-leak-detector enabled.")
+  (log/info "aleph.resource-leak-detector disabled. This means resource leaks will be reported less accurately."
+            "To enable it, use the `:leak-detection` Leiningen profile."))