Python: Document a bunch of hasLocationInfo methods.

If only we had been _somewhat consistent in how we named the
parameters for these...

python/ql/src/analysis/DefinitionTracking.qll

@@ -468,7 +468,13 @@ Definition getUniqueDefinition(Expr use) {
 /** Helper class to get suitable locations for attributes */
 class NiceLocationExpr extends @py_expr {
     string toString() { result = this.(Expr).toString() }
-
+    /**
+     * Holds if this element is at the specified location.
+     * The location spans column `bc` of line `bl` to
+     * column `ec` of line `el` in file `f`.
+     * For more information, see
+     * [Locations](https://help.semmle.com/QL/learn-ql/ql/locations.html).
+     */
     predicate hasLocationInfo(string f, int bl, int bc, int el, int ec) {
         /* Attribute location for x.y is that of 'y' so that url does not overlap with that of 'x' */
         exists(int abl, int abc | this.(Attribute).getLocation().hasLocationInfo(f, abl, abc, el, ec) |