Docs: Remove Library Model documentation

Library Model is deprecated, so remove the related description and
documentations.

Signed-off-by: Summer Qin <summer.qin@arm.com>
Change-Id: I3c9d1bba97c011183bea17bfd5ea7d9ec834802b
diff --git a/docs/integration_guide/tfm_fpu_support.rst b/docs/integration_guide/tfm_fpu_support.rst
index cde89dd..520146e 100644
--- a/docs/integration_guide/tfm_fpu_support.rst
+++ b/docs/integration_guide/tfm_fpu_support.rst
@@ -15,7 +15,7 @@
   2021.10`` and later version shall be used to mitigate VLLDM instruction
   security vulnerability [4]_.
 * Support Inter-Process Communication (IPC) [5]_ model in TF-M, and doesn't
-  support LIBRARY or SFN model.
+  support SFN model.
 * Support Armv8-M mainline.
 * Support isolation level 1,2,3.
 * Does not support use FPU in First-Level Interrupt Handling (FLIH) [6]_ at