[tracing] Fix broken link in design doc

Fix a couple of intra-document links in the design doc.

Bug: None
Test: previewed in gitiles
Change-Id: Idc3251c5a01b8458f0de675bcf77e18ae29a2cab
diff --git a/docs/tracing/design.md b/docs/tracing/design.md
index f056ae3..e27b6aa 100644
--- a/docs/tracing/design.md
+++ b/docs/tracing/design.md
@@ -227,7 +227,7 @@
 
 What happens when a trace provider's trace buffer becomes full while a trace
 is running depends on the buffering mode.
-See [Buffering Modes](#Buffering Modes) below.
+See [Buffering Modes](#Buffering-Modes) below.
 
 When tracing finishes, the trace manager asks all of the active trace providers
 to stop tracing then waits a short time for them to acknowledge that they
@@ -239,7 +239,7 @@
 as long as they managed to store some data into their trace buffers.
 Note that in streaming mode the trace manager only needs to save the
 currently active rolling buffer.
-See [Buffering Modes](#Buffering Modes) below.
+See [Buffering Modes](#Buffering-Modes) below.
 
 The trace manager delivers the resulting trace archive to its client through
 a socket.  This data is guaranteed to be well-formed according to the