Fix broken link in docs.

TBR=hjd@google.com

Change-Id: I4ffa35b162b2ddb00d18f0c5a2e4d92ef23dd937
diff --git a/docs/heapprofd.md b/docs/heapprofd.md
index f4faa29..84219fd 100644
--- a/docs/heapprofd.md
+++ b/docs/heapprofd.md
@@ -150,7 +150,7 @@
 
 ### Profile is empty
 Check whether your target process is eligible to be profiled by consulting
-[Target process](#Target_process) above.
+[Target processes](#target-processes) above.
 
 ## Known Issues