bsps: Adjust architecture Doxygen groups

- Use CamelCase as it is not used in our C code.  Enables simple search and
   replace.

 - Prefix with "RTEMS" to aid deployment and integration.  It aids
   searching and sorting.

Update #3706.

bsps/shared/doxygen.h

@@ -1,15 +1,14 @@
 /**
- *  @defgroup bsp_shared SHARED
+ * @defgroup RTEMSBSPs Board Support Packages
  *
- *  @ingroup bsp_kit
- *
- *  @brief SHARED Board Support Packages
+ * @brief Board Support Packages and Support Modules
+ * (BSPs).
  */
 
 /**
- *  @defgroup shared_tod SHARED TOD Modules
+ * @defgroup RTEMSBSPsShared Shared
  *
- *  @ingroup bsp_shared
+ * @ingroup RTEMSBSPs
  *
- *  @brief SHARED TOD Modules
- */
+ * @brief Shared Support for Board Support Packages
+ */