Update Base64 documentation

velox/docs/functions/presto/binary.rst

@@ -8,9 +8,9 @@ Binary Functions
 
 .. function:: from_base64(string) -> varbinary
 
-    Decodes a Base64-encoded ``string`` back into its original binary form. 
-    This function is capable of handling both fully padded and non-padded Base64 encoded strings. 
-    Partially padded Base64 strings are not supported and will result in an error.
+    Decodes a Base64-encoded ``string`` back into its original binary form.
+    This function is capable of handling both fully padded and non-padded Base64 encoded strings.
+    Partially padded Base64 strings are not supported and will result in a "UserError" status being returned.
 
     Examples
     --------
@@ -24,10 +24,10 @@ Binary Functions
 
     Query with partial-padded Base64 string:
     ::
-        SELECT from_base64('SGVsbG8gV29ybGQgZm9yIHZlbG94IQ='); -- Error : Base64::decode() - invalid input string: string length is not a multiple of 4.
+        SELECT from_base64('SGVsbG8gV29ybGQgZm9yIHZlbG94IQ='); -- UserError: Base64::decode() - invalid input string: string length is not a multiple of 4.
 
     In the above examples, both the fully padded and non-padded Base64 strings ('SGVsbG8gV29ybGQ=' and 'SGVsbG8gV29ybGQ') decode to the binary representation of the text 'Hello World'.
-    While, partial-padded Base64 string 'SGVsbG8gV29ybGQgZm9yIHZlbG94IQ=' will lead to an velox error.
+    A partial-padded Base64 string 'SGVsbG8gV29ybGQgZm9yIHZlbG94IQ=' will result in a "UserError" status indicating the Base64 string is invalid.
 
 .. function:: from_base64url(string) -> varbinary