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, 1 insertions, 1 deletions

diff --git a/numeric.c b/numeric.c
index 84d2319053..59c9468fc7 100644
--- a/numeric.c
+++ b/numeric.c
@@ -1277,7 +1277,7 @@ no leading zeros).  Otherwise it returns TRUE, and sets C<*valptr> to that
 value.
 
 If you constrain the portion of C<pv> that is looked at by this function (by
-passing a non-NULL C<endptr>), and if the intial bytes of that portion form a
+passing a non-NULL C<endptr>), and if the initial bytes of that portion form a
 valid value, it will return TRUE, setting C<*endptr> to the byte following the
 final digit of the value.  But if there is no constraint at what's looked at,
 all of C<pv> must be valid in order for TRUE to be returned.  C<*endptr> is