perlapi: Combine Strtod, my_strtod

And clarify the pod

numeric.c

@@ -76,18 +76,34 @@ S_strtod(pTHX_ const char * const s, char ** e)
 
 /*
 
-=for apidoc my_strtod
+=for apidoc      my_strtod
+=for apidoc_item Strtod
 
-This function is equivalent to the libc strtod() function, and is available
-even on platforms that lack plain strtod().  Its return value is the best
-available precision depending on platform capabilities and F<Configure>
-options.
+These are identical.
+
+They act like the libc C<L<strtod(3)>> function, with three exceptions:
+
+=over
+
+=item 1.
+
+Their return value is an NV.  Plain C<strod> returns a double precision value.
+
+=item 2.
+
+Plain C<strtod> always is expecting the radix character (or string) to be the
+one specified by the underlying locale the program is executing in.  This is
+almost universally a dot (U+002E) or a comma (U+002C).
+
+In contrast, these expect the radix to be a dot, except when called from within
+the scope of S<C<use locale>>, in which case they act like plain C<strtod>,
+expecting the radix to be that specified by the current locale.
+
+=item 3.
 
-It properly handles the locale radix character, meaning it expects a dot except
-when called from within the scope of S<C<use locale>>, in which case the radix
-character should be that specified by the current locale.
+These are are available even on platforms that lack plain strtod().
 
-The synonym Strtod() may be used instead.
+=back
 
 =cut
 

perl.h

@@ -7915,9 +7915,7 @@ END_EXTERN_C
 
 =for apidoc_section $numeric
 
-=for apidoc AmTR|NV|Strtod|NN const char * const s|NULLOK char ** e
-
-This is a synonym for L</my_strtod>.
+=for apidoc_defn AmTR|NV|Strtod|NN const char * const s|NULLOK char **e
 
 =for apidoc AmTR|NV|Strtol|NN const char * const s|NULLOK char ** e|int base
 

t/porting/known_pod_issues.dat

@@ -344,6 +344,7 @@ String::Base
 String::Scanf
 String::Util
 strstr(3)
+strtod(3)
 strtok(3)
 strtol(3)
 Switch