Fix link to slicer plot

Author: jl-wynen

docs/tutorials/1_exploring-data.ipynb

@@ -517,7 +517,7 @@
     "- Inspect and understand the HTML view of the result.\n",
     "- Plot the result.\n",
     "  There are two options:\n",
-    "  - Use [Plopp's `slicer` utility](https://scipp.github.io/plopp/user-guide/plot-types/slicer-plot.html) to navigate the different layers using a slider (requires `%matplotlib widget` to enable interactive figures)\n",
+    "  - Use [Plopp's `slicer` utility](https://scipp.github.io/plopp/plotting/slicer-plot.html) to navigate the different layers using a slider (requires `%matplotlib widget` to enable interactive figures)\n",
     "  - Use `sc.plot` after collapsing dimensions, `sc.collapse(grouped, keep='tof')`\n",
     "- Bonus: When grouping by straw layers, there is a different number of straws in the center layer of each tube (3 instead of 2) due to the flower-pattern arrangement of straws.\n",
     "  Define a helper data array with data set to 1 for each spectrum (using, e.g., `norm = sc.DataArray(data=sc.ones_like(layer), coords={'layer':layer})`), group by layers and sum over spectrum as above, and use this result to normalize the layer-grouped data from above to spectrum count.\n",