Remove duplicate property mention

semantics_label was mentioned twice in the docs for Image control. Removed the more vague one, and preserved the one with more information, which still covers the description of the duplicate.

Author: typedecker

docs/controls/image.md

@@ -169,10 +169,6 @@ How to paint any portions of the layout bounds not covered by the image.
 
 Values is of type [`ImageRepeat`](/docs/reference/types/imagerepeat) and defaults to `ImageRepeat.NO_REPEAT`.
 
-### `semantics_label`
-
-A semantics label for this image.
-
 ### `tooltip`
 
 The text displayed when hovering a mouse over the Image.
@@ -185,4 +181,4 @@ If not set, the image will pick a size that best preserves its intrinsic aspect
 
 :::note
 It is strongly recommended that either both the width and the height be specified, or that the Image be placed in a context that sets tight layout constraints, so that the image does not change size as it loads. Consider using `fit` to adapt the image's rendering to fit the given width and height if the exact image dimensions are not known in advance.
-:::
+:::