Docs: Fix #2905 utilities.image_to_url() image parameter documentation issues

Author: elliot-100

folium/utilities.py

@@ -169,12 +169,14 @@ def image_to_url(
 
     Parameters
     ----------
-    image: string, file or array-like object
-        * If string, it will be written directly in the output file.
-        * If file, it's content will be converted as embedded in the
-          output file.
-        * If array-like, it will be converted to PNG base64 string and
-          embedded in the output.
+    image: string or array-like object
+        * If string is a path to an image file, its content will be converted and
+          embedded in the output URL.
+        * If string is a URL, it will be linked in the output URL.
+        * Otherwise a string will be assumed to be JSON and embedded in the output URL.
+        * If array-like, it will be converted to PNG base64 string and embedded in the
+          output URL.
+
     origin: ['upper' | 'lower'], optional, default 'upper'
         Place the [0, 0] index of the array in the upper left or
         lower left corner of the axes.