Backport PR #21330: Fix medical image caption in tutorial

dstansby · meeseeksmachine · commit 4c735ce79d1f · 2021-10-11T08:23:40.000Z
diff --git a/tutorials/introductory/sample_plots.py b/tutorials/introductory/sample_plots.py
@@ -42,7 +42,7 @@
    :target: ../../gallery/images_contours_and_fields/image_demo.html
    :align: center
 
-   Example of using :func:`~matplotlib.pyplot.imshow` to display a CT scan
+   Example of using :func:`~matplotlib.pyplot.imshow` to display an MRI
 
 .. _screenshots_pcolormesh_demo:
 
