Make names of malloc hooks / preload more descriptive.

Change-Id: I882128654e472d42e2f7229a62ca3ff2ec290a3d

docs/data-sources/native-heap-profiler.md

diff --git a/docs/data-sources/native-heap-profiler.md b/docs/data-sources/native-heap-profiler.md
index 1146a90..83a7a46 100644
--- a/docs/data-sources/native-heap-profiler.md
+++ b/docs/data-sources/native-heap-profiler.md
@@ -441,7 +441,7 @@
 Finally, run your target (e.g. trace_processor_shell) with LD_PRELOAD
 
 ```
-LD_PRELOAD=out/linux_clang_release/libheapprofd_preload.so out/linux_clang_release/trace_processor_shell <trace>
+LD_PRELOAD=out/linux_clang_release/libheapprofd_glibc_preload.so out/linux_clang_release/trace_processor_shell <trace>
 ```
 
 Then, Ctrl-C the Perfetto invocation and upload ~/heapprofd-trace to the