tests: remove incorrect comment from code_relocation for RISCV

This was copied from the ARM version of the test's linker script, which
in turn seems to have been copied from another linker script at some
point. Remove the incorrect comment.

Signed-off-by: Peter Marheine <[email protected]>

Author: tari

tests/application_development/code_relocation/linker_riscv_qemu_sram2.ld

@@ -4,13 +4,6 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-/**
- * @file
- * @brief Linker command/script file
- *
- * Linker script for the Cortex-M platforms.
- */
-
 #include <zephyr/linker/sections.h>
 #include <zephyr/devicetree.h>