DOC: Use Unicode characters for diagrams

This also fixes some broken diagrams due to incorrect code block setup.

Author: QuLogic

lib/matplotlib/axes/_axes.py

@@ -5826,9 +5826,9 @@ def pcolor(self, *args, shading=None, alpha=None, norm=None, cmap=None,
             The coordinates of the corners of quadrilaterals of a pcolormesh::
 
                 (X[i+1, j], Y[i+1, j])       (X[i+1, j+1], Y[i+1, j+1])
-                                      +-----+
-                                      |     |
-                                      +-----+
+                                      ●╶───╴●
+                                      │     │
+                                      ●╶───╴●
                     (X[i, j], Y[i, j])       (X[i, j+1], Y[i, j+1])
 
             Note that the column index corresponds to the x-coordinate, and
@@ -6068,9 +6068,9 @@ def pcolormesh(self, *args, alpha=None, norm=None, cmap=None, vmin=None,
             The coordinates of the corners of quadrilaterals of a pcolormesh::
 
                 (X[i+1, j], Y[i+1, j])       (X[i+1, j+1], Y[i+1, j+1])
-                                      +-----+
-                                      |     |
-                                      +-----+
+                                      ●╶───╴●
+                                      │     │
+                                      ●╶───╴●
                     (X[i, j], Y[i, j])       (X[i, j+1], Y[i, j+1])
 
             Note that the column index corresponds to the x-coordinate, and

lib/matplotlib/axes/_base.py

@@ -1892,17 +1892,15 @@ def set_anchor(self, anchor, share=False):
             Either an (*x*, *y*) pair of relative coordinates (0 is left or
             bottom, 1 is right or top), 'C' (center), or a cardinal direction
             ('SW', southwest, is bottom left, etc.).  str inputs are shorthands
-            for (*x*, *y*) coordinates, as shown in the following table::
-
-            .. code-block:: none
-
-               +-----------------+-----------------+-----------------+
-               | 'NW' (0.0, 1.0) | 'N' (0.5, 1.0)  | 'NE' (1.0, 1.0) |
-               +-----------------+-----------------+-----------------+
-               | 'W'  (0.0, 0.5) | 'C' (0.5, 0.5)  | 'E'  (1.0, 0.5) |
-               +-----------------+-----------------+-----------------+
-               | 'SW' (0.0, 0.0) | 'S' (0.5, 0.0)  | 'SE' (1.0, 0.0) |
-               +-----------------+-----------------+-----------------+
+            for (*x*, *y*) coordinates, as shown in the following diagram::
+
+               ┌─────────────────┬─────────────────┬─────────────────┐
+               │ 'NW' (0.0, 1.0) │ 'N' (0.5, 1.0)  │ 'NE' (1.0, 1.0) │
+               ├─────────────────┼─────────────────┼─────────────────┤
+               │ 'W'  (0.0, 0.5) │ 'C' (0.5, 0.5)  │ 'E'  (1.0, 0.5) │
+               ├─────────────────┼─────────────────┼─────────────────┤
+               │ 'SW' (0.0, 0.0) │ 'S' (0.5, 0.0)  │ 'SE' (1.0, 0.0) │
+               └─────────────────┴─────────────────┴─────────────────┘
 
         share : bool, default: False
             If ``True``, apply the settings to all shared Axes.

lib/mpl_toolkits/axes_grid1/axes_rgb.py

@@ -61,15 +61,15 @@ class RGBAxes:
     """
     4-panel `~.Axes.imshow` (RGB, R, G, B).
 
-    Layout:
-
-        +---------------+-----+
-        |               |  R  |
-        +               +-----+
-        |      RGB      |  G  |
-        +               +-----+
-        |               |  B  |
-        +---------------+-----+
+    Layout::
+
+        ┌───────────────┬─────┐
+        │               │  R  │
+        │               ├─────┤
+        │      RGB      │  G  │
+        │               ├─────┤
+        │               │  B  │
+        └───────────────┴─────┘
 
     Subclasses can override the ``_defaultAxesClass`` attribute.
     By default RGBAxes uses `.mpl_axes.Axes`.

tutorials/toolkits/axes_grid.py

@@ -268,13 +268,13 @@
 
 .. code-block:: none
 
-   +--------+--------+--------+--------+
-   | (2, 0) | (2, 1) | (2, 2) | (2, 3) |
-   +--------+--------+--------+--------+
-   | (1, 0) | (1, 1) | (1, 2) | (1, 3) |
-   +--------+--------+--------+--------+
-   | (0, 0) | (0, 1) | (0, 2) | (0, 3) |
-   +--------+--------+--------+--------+
+   ┌────────┬────────┬────────┬────────┐
+   │ (2, 0) │ (2, 1) │ (2, 2) │ (2, 3) │
+   ├────────┼────────┼────────┼────────┤
+   │ (1, 0) │ (1, 1) │ (1, 2) │ (1, 3) │
+   ├────────┼────────┼────────┼────────┤
+   │ (0, 0) │ (0, 1) │ (0, 2) │ (0, 3) │
+   └────────┴────────┴────────┴────────┘
 
 such that the bottom row has a fixed height of 2 (inches) and the top two rows
 have a height ratio of 2 (middle) to 3 (top).  (For example, if the grid has