Documentation: admin-guide: Move intel_powerclamp documentation

Create a folder "thermal" under Documentation/admin-guide and move
intel_powerclamp documentation to this folder.
Signed-off-by: NSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

Documentation/admin-guide/index.rst

@@ -116,6 +116,7 @@ configure specific aspects of kernel behavior to your liking.
    svga
    syscall-user-dispatch
    sysrq
+   thermal
    thunderbolt
    ufs
    unicode

Documentation/driver-api/thermal/index.rst

@@ -14,7 +14,6 @@ Thermal
 
    exynos_thermal
    exynos_thermal_emulation
-   intel_powerclamp
    nouveau_thermal
    x86_pkg_temperature_thermal
    intel_dptf

MAINTAINERS

@@ -20707,6 +20707,7 @@ S:	Supported
 Q:	https://patchwork.kernel.org/project/linux-pm/list/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git thermal
 F:	Documentation/ABI/testing/sysfs-class-thermal
+F:	Documentation/admin-guide/thermal/
 F:	Documentation/devicetree/bindings/thermal/
 F:	Documentation/driver-api/thermal/
 F:	drivers/thermal/