docs: added relevant comments

Author: mfranzke

source/_patterns/01-elements/_form-elements.scss

@@ -115,6 +115,8 @@
 %form-element-counter {
 	margin-top: to-rem($pxValue: 12);
 
+	// TODO: add CSS anchor positioning
+
 	// Description styles
 	// TODO: This probably still needs to get further changed to a general "hint" pattern or similar
 	&,

source/_patterns/01-elements/input/input~maxlength.md

@@ -4,3 +4,5 @@ order: 12
 ---
 
 To set the maximum length of allowed characters on an input element, you could use the `maxlength`-attribute on the input field. This would additionally provide a visual counter.
+
+Please keep in mind that you'll probably have to position the output element yourself previous to in the context of e.g. a wrapping HTML element; we'll have a future solution by CSS Anchor Positioning as well.