Documentation: arm: remove stih415/stih416 related entries

ST's STiH415 and STiH416 platforms support have been removed since
a long time already.  This commit updates the sti related documentation
overview to remove related entries and update the sti part to add
STiH407/STiH410 and STiH418 platforms which are still actively
supported.

Signed-off-by: Alain Volmat <avolmat@me.com>
Link: https://lore.kernel.org/r/20230416185349.18156-1-avolmat@me.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Author: Alain Volmat

Documentation/arm/index.rst

@@ -69,11 +69,9 @@ SoC-specific documents
 
    spear/overview
 
-   sti/stih416-overview
    sti/stih407-overview
    sti/stih418-overview
    sti/overview
-   sti/stih415-overview
 
    vfp/release-notes
 

Documentation/arm/sti/overview.rst

@@ -7,22 +7,18 @@ Introduction
 
   The ST Microelectronics Multimedia and Application Processors range of
   CortexA9 System-on-Chip are supported by the 'STi' platform of
-  ARM Linux. Currently STiH415, STiH416 SOCs are supported with both
-  B2000 and B2020 Reference boards.
+  ARM Linux. Currently STiH407, STiH410 and STiH418 are supported.
 
 
 configuration
 -------------
 
-  A generic configuration is provided for both STiH415/416, and can be used as the
-  default by::
-
-	make stih41x_defconfig
+  The configuration for the STi platform is supported via the multi_v7_defconfig.
 
 Layout
 ------
 
-  All the files for multiple machine families (STiH415, STiH416, and STiG125)
+  All the files for multiple machine families (STiH407, STiH410, and STiH418)
   are located in the platform code contained in arch/arm/mach-sti
 
   There is a generic board board-dt.c in the mach folder which support