Fix up typos

Ran automated checker for common typos [1]. Most of these changes have
no functional change *except* for `./ci/sim_run.sh` where, previously
the `bootstrap` feature wasn't being selected properly.

I didn't touch anything in the `./ext/` folder as anything in there
should probably be fixed in the upstream repo.

[1] https://github.com/codespell-project/codespell

Signed-off-by: Sam Bristow <sam@bristow.nz>
diff --git a/boot/zephyr/Kconfig b/boot/zephyr/Kconfig
index e0a7c02..42e8d82 100644
--- a/boot/zephyr/Kconfig
+++ b/boot/zephyr/Kconfig
@@ -127,7 +127,7 @@
 	  uses a much simpler code path.
 
 config BOOT_BOOTSTRAP
-	bool "Boostrap erased the primary slot from the secondary slot"
+	bool "Bootstrap erased the primary slot from the secondary slot"
 	default n
 	help
 	  If y, enables bootstraping support. Bootstrapping allows an erased
diff --git a/boot/zephyr/include/flash_map_backend/flash_map_backend.h b/boot/zephyr/include/flash_map_backend/flash_map_backend.h
index 33c34f0..a9472ef 100644
--- a/boot/zephyr/include/flash_map_backend/flash_map_backend.h
+++ b/boot/zephyr/include/flash_map_backend/flash_map_backend.h
@@ -77,7 +77,7 @@
 int flash_area_sector_from_off(off_t off, struct flash_sector *sector);
 
 /*
- * Returns the value expected to be read when accesing any erased
+ * Returns the value expected to be read when accessing any erased
  * flash byte.
  */
 uint8_t flash_area_erased_val(const struct flash_area *fap);