Issue #378974 reported by DrZaius: Eradicate references to API.txt in the README.txt file.

README.txt

@@ -63,14 +63,14 @@ Macro
 1) GMap settings, like the GMap Location module's settings page.
 2) Any node where the GMap filter is enabled (as part of the input format).
 
-A GMap macro will look something like this (see API.txt for syntax details):
+A GMap macro will look something like this (see the advanced help pages (or the files in help/ in the module folder) for syntax details):
 [gmap markers=blue::41.902277040963696,-87.6708984375 |zoom=5 |center=42.94033923363183,-88.857421875 |width=300px |height=200px |control=Small |type=Map]
 
 The GMap Macro Builder is a GUI for creating GMap macros; you may use it to create a map with points, lines, polygons, and circles, and then copy and paste the resulting macro text. After you insert the macro into a node, you can edit it using raw values that you get from elsewhere to create a different set of points or lines on the map.
 
 If you've enabled the gmap_macro_builder.module, you can access the GMap macro builder at the 'map/macro' path (there will be "Build a GMap macro" link in your Navigation menu).
 
-Note that there are many more options you can set on your maps if you are willing to edit macros by hand. For example, you may add KML or GeoRSS overlays to GMaps, but this option isn't available through the macro builder. Again, see API.txt for syntax details.
+Note that there are many more options you can set on your maps if you are willing to edit macros by hand. For example, you may add KML or GeoRSS overlays to GMaps, but this option isn't available through the macro builder. Again, see the advanced help pages for syntax details.
 
 
 User and node maps