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/bootutil/src/image_rsa.c b/boot/bootutil/src/image_rsa.c
index 53a4591..3e21a6d 100644
--- a/boot/bootutil/src/image_rsa.c
+++ b/boot/bootutil/src/image_rsa.c
@@ -191,7 +191,7 @@
      * The salt length is not known at this point.
      */
 
-    /* Step 4.  If the rightmost octect of EM does have the value
+    /* Step 4.  If the rightmost octet of EM does have the value
      * 0xbc, output inconsistent and stop.
      */
     if (em[PSS_EMLEN - 1] != 0xbc) {