Add API page for isaaclab_physx.sim.views

FabricFrameView is referenced by fully-qualified name in the migration
guide and in this PR's changelog fragment, but no RST file documented
the module - so the Sphinx :class: and :meth: cross-refs were not
resolvable.  Add a thin automodule page mirroring the sibling pages
under docs/source/api/lab_physx/ and register it in the API index
toctree.  This also picks up the new clear_static_caches() classmethod
automatically via :members:.

Author: pv-nvidia

docs/source/api/index.rst

@@ -132,6 +132,7 @@ The following modules are available in the ``isaaclab_physx`` extension:
    sensors
    sim.schemas
    sim.spawners
+   sim.views
 
 .. toctree::
    :hidden:
@@ -144,6 +145,7 @@ The following modules are available in the ``isaaclab_physx`` extension:
    lab_physx/isaaclab_physx.sensors
    lab_physx/isaaclab_physx.sim.schemas
    lab_physx/isaaclab_physx.sim.spawners
+   lab_physx/isaaclab_physx.sim.views
 
 isaaclab_newton extension
 -------------------------

docs/source/api/lab_physx/isaaclab_physx.sim.views.rst

@@ -0,0 +1,17 @@
+isaaclab\_physx.sim.views
+=========================
+
+.. automodule:: isaaclab_physx.sim.views
+
+   .. rubric:: Classes
+
+   .. autosummary::
+
+      FabricFrameView
+
+Fabric Frame View
+-----------------
+
+.. autoclass:: FabricFrameView
+   :members:
+   :show-inheritance: