Fix "customer timer" -> "custom timer" (reported by Kirk Strauser on docs@)
diff --git a/Doc/library/profile.rst b/Doc/library/profile.rst
index aefc024..f2453f1 100644
--- a/Doc/library/profile.rst
+++ b/Doc/library/profile.rst
@@ -600,8 +600,8 @@
.. _profile-timers:
-Using a customer timer
-======================
+Using a custom timer
+====================
If you want to change how current time is determined (for example, to force use
of wall-clock time or elapsed process time), pass the timing function you want