docs: Do not include from kernel/rcu/srcu.c

That file went away with commit bd8cc5a0 (srcu: Remove Classic SRCU)
during the 4.13 merge window, leading to errors like:

  Error: Cannot open file ./kernel/rcu/srcu.c

during the docs build.
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/driver-api/basics.rst

@@ -106,9 +106,6 @@ Kernel utility functions
 .. kernel-doc:: kernel/sys.c
    :export:
 
-.. kernel-doc:: kernel/rcu/srcu.c
-   :export:
-
 .. kernel-doc:: kernel/rcu/tree.c
    :export: