fix star yz probing links

Author: rickwierenga

docs/user_guide/00_liquid-handling/hamilton-star/_hamilton-star.rst

@@ -9,6 +9,7 @@ Tools for working with Hamilton-STAR specific functions.
    basic
    iswap-module
    star_lld
+   y-probing
    z-probing
    foil
    96head

docs/user_guide/00_liquid-handling/hamilton-star/y-probing.ipynb

@@ -6,7 +6,7 @@
    "source": [
     "# Y-probing\n",
     "\n",
-    "With PyLabRobot, you can probe the y position of any object on a STAR(let) deck. See also [z probing](../z-probing.ipynb) for doing the same in the z direction.\n",
+    "With PyLabRobot, you can probe the y position of any object on a STAR(let) deck. See also [z probing](./z-probing) for doing the same in the z direction.\n",
     "\n",
     "```{warning}\n",
     "This example uses the teaching tips. These are metal tips that are not forgiving. Be particularly careful when moving the channels around to avoid collisions.\n",

docs/user_guide/00_liquid-handling/hamilton-star/z-probing.ipynb

@@ -6,7 +6,7 @@
    "source": [
     "# Z-probing\n",
     "\n",
-    "With PyLabRobot, one can probe the surface of any object on a STAR(let) deck. This effectively makes the STAR act as a [Coordinate-Measurement Machine (CMM)](https://en.wikipedia.org/wiki/Coordinate-measuring_machine). See also [y probing](./y-probing.ipynb) for doing the same in the y direction.\n",
+    "With PyLabRobot, one can probe the surface of any object on a STAR(let) deck. This effectively makes the STAR act as a [Coordinate-Measurement Machine (CMM)](https://en.wikipedia.org/wiki/Coordinate-measuring_machine). See also [y probing](./y-probing) for doing the same in the y direction.\n",
     "\n",
     "There are two ways to probe the surface of an object:\n",
     "\n",