kconfig: tweak Kconfig prompts

Tweak some Kconfig prompts after the removal of "Enable...".

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
diff --git a/Kconfig.zephyr b/Kconfig.zephyr
index 3ecd747..c6a2ae3 100644
--- a/Kconfig.zephyr
+++ b/Kconfig.zephyr
@@ -221,7 +221,7 @@
 menu "Linker Sections"
 
 config LINKER_USE_BOOT_SECTION
-	bool "Usage of Boot Linker Section"
+	bool "Use Boot Linker Section"
 	help
 	  If enabled, the symbols which are needed for the boot process
 	  will be put into another linker section reserved for these
@@ -231,7 +231,7 @@
 	  board or custom linker script.
 
 config LINKER_USE_PINNED_SECTION
-	bool "Usage of Pinned Linker Section"
+	bool "Use Pinned Linker Section"
 	help
 	  If enabled, the symbols which need to be pinned in memory
 	  will be put into another linker section reserved for pinned