docs: Update the requirements and fix the build

Signed-off-by: John DeNisco <jdenisco@cisco.com>
Change-Id: I30e37f7e549083337b11ace95b4ff4f427d9fc8c
diff --git a/docs/troubleshooting/sanitizer.rst b/docs/troubleshooting/sanitizer.rst
index af23994..d4e9a4d 100644
--- a/docs/troubleshooting/sanitizer.rst
+++ b/docs/troubleshooting/sanitizer.rst
@@ -1,15 +1,15 @@
 .. _sanitizer:
 
-**************
+*****************
 Google Sanitizers
-**************
+*****************
 
 VPP is instrumented to support `Google Sanitizers <https://github.com/google/sanitizers>`_.
 As of today, only `AddressSanitizer <https://github.com/google/sanitizers/wiki/AddressSanitizer>`_
 is supported and only for the heap.
 
 AddressSanitizer
-==============
+================
 
 `AddressSanitizer <https://github.com/google/sanitizers/wiki/AddressSanitizer>`_  (aka ASan) is a memory
 error detector for C/C++. Think Valgrind but much faster.