docs: timers: drop documentation about LB_BIAS

The LB_BIAS feature was removed in commit 1c1b8a7b03ef ("sched/fair:
Replace source_load() & target_load() with weighted_cpuload()"), so drop
the mention that it is disabled in the no_hz case.

Signed-off-by: Julia Lawall <[e-mail]>

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Corbet <[e-mail]>

Documentation/timers/no_hz.rst

···
 	slightly differently than those for non-adaptive-tick CPUs.
 	This might in turn perturb load-balancing of real-time tasks.
 
-6.	The LB_BIAS scheduler feature is disabled by adaptive ticks.
-
 Although improvements are expected over time, adaptive ticks is quite
 useful for many types of real-time and compute-intensive applications.
 However, the drawbacks listed above mean that adaptive ticks should not