langref: update to document --error-limit flag

Author: scheibo

doc/langref.html.in

@@ -5373,8 +5373,9 @@ test "fn reflection" {
       gets assigned the same integer value.
       </p>
       <p>
-      The number of unique error values across the entire compilation should determine the size of the error set type.
-      However right now it is hard coded to be a {#syntax#}u16{#endsyntax#}. See <a href="https://github.com/ziglang/zig/issues/786">#786</a>.
+      The error set type defaults to a {#syntax#}u16{#endsyntax#}, though if the maximum number of distinct
+      error values is provided via the <kbd>--error-limit [num]</kbd> command line parameter an integer type
+      with the minimum number of bits required to represent all of the error values will be used.
       </p>
       <p>
       You can {#link|coerce|Type Coercion#} an error from a subset to a superset: