docs: Remove redundant "``" from Requirements.rst

The docbook system has learned that "()" designates a function, so
this commit removes the no-longer-needed "``" to improve readability
of the raw .rst file.

Reported-by: Peter Zijlstra <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: Jonathan Corbet <[email protected]>
[ paulmck: Apply Stephen Rothwell feedback. ]
Signed-off-by: Paul E. McKenney <[email protected]>
1 file changed