DOC fix mistakes in the machine learning map (scikit-learn#29123)

Author: Charlie-XIAO

doc/images/ml_map.svg

@@ -3,8 +3,9 @@ https://peekaboo-vision.blogspot.de/2013/01/machine-learning-cheat-sheet-for-sci
 
 The current version of the chart is located at `doc/images/ml_map.svg` in SVG+XML
 format, created using [draw.io](https://draw.io/). To edit the chart, open the file in
-draw.io, make changes, and export as SVG with the same filename. Export configurations
-are:
+draw.io, make changes, and save. This should update the chart in-place. Another option
+would be to re-export the chart as SVG and replace the existing file. The options used
+for exporting the chart are:
 
 - Zoom: 100%
 - Border width: 15
@@ -13,5 +14,7 @@ are:
 - Appearance: Light
 
 Each node in the chart that contains an estimator should have a link, where the root
-directory is at `../../`. Note that after exporting the SVG, the links may be prefixed
-with e.g. `https://app.diagrams.net/`. Remember to check and remove them.
+directory is at `../../`. Note that after updating or re-exporting the SVG, the links
+may be prefixed with e.g. `https://app.diagrams.net/`. Remember to check and remove
+them, for instance by replacing all occurrences of `https://app.diagrams.net/../../`
+with `../../`.

doc/tutorial/machine_learning_map/README.md

@@ -11,9 +11,10 @@ data and different problems.
 
 The flowchart below is designed to give users a bit of a rough guide on how to approach
 problems with regard to which estimators to try on your data. Click on any estimator in
-the chart below to see its documentation. Use scroll wheel to zoom in and out, and click
-and drag to pan around. You can also download the chart:
-:download:`ml_map.svg <../../images/ml_map.svg>`.
+the chart below to see its documentation. The 😭 emoji is to be read as "if this
+estimator does not achieve the desired outcome, then follow the arrow and try the next
+one". Use scroll wheel to zoom in and out, and click and drag to pan around. You can
+also download the chart: :download:`ml_map.svg <../../images/ml_map.svg>`.
 
 .. raw:: html