Correct typos as per GH 20435

In GH 20435 many typos in our C code were corrected.  However, this pull
request was not applied to blead and developed merge conflicts.  I
extracted diffs for the individual modified files and applied them with
'git apply', excepting four files where patch conflicts were reported.
Those files were:

        handy.h
        locale.c
        regcomp.c
        toke.c

We can handle these in a subsequent commit. Also, had to run these two
programs to keep 'make test_porting' happy:

        $ ./perl -Ilib regen/uconfig_h.pl
        $ ./perl -Ilib regen/regcomp.pl regnodes.h

1 files changed, 2 insertions, 2 deletions

diff --git a/perl.c b/perl.c
index b19578c828..14b3d1b634 100644
--- a/perl.c
+++ b/perl.c
@@ -388,7 +388,7 @@ perl_construct(pTHXx)
             PERL_HASH_WITH_STATE(PL_hash_state,PL_hash_chars[256],str,0);
         }
 #endif
-        /* at this point we have initialezed the hash function, and we can start
+        /* at this point we have initialized the hash function, and we can start
          * constructing hashes */
         PL_hash_seed_set= TRUE;
     }
@@ -3475,7 +3475,7 @@ Perl_get_debug_opts(pTHX_ const char **s, bool givehelp)
          * If there is a free slot available marked with '?' feel
          * free to reuse it for something else.
          *
-         * Regardles remember to update DEBUG_MASK in perl.h, and
+         * Regardless remember to update DEBUG_MASK in perl.h, and
          * update the documentation above AND in pod/perlrun.pod.
          *
          * Note that the ? indicates an unused slot. As the code below