DOC: Simplify some grid tables

These are not so complicated that they can't use simple tables, though
in one case, I thought a definition list looked better.

Author: QuLogic

lib/matplotlib/quiver.py

@@ -150,9 +150,9 @@
     =================  =================   ==================
     units              zoom                figure size change
     =================  =================   ==================
-    'x', 'y', 'xy'     arrow size scales   -
-    'width', 'height'  -                   arrow size scales
-    'dots', 'inches'   -                   -
+    'x', 'y', 'xy'     arrow size scales   —
+    'width', 'height'  —                   arrow size scales
+    'dots', 'inches'   —                   —
     =================  =================   ==================
 
 width : float, optional

lib/matplotlib/style/core.py

@@ -186,18 +186,16 @@ def context(style, after_reset=False):
     style : str, dict, Path or list
         A style specification. Valid options are:
 
-        +------+-------------------------------------------------------------+
-        | str  | The name of a style or a path/URL to a style file. For a    |
-        |      | list of available style names, see `.style.available`.      |
-        +------+-------------------------------------------------------------+
-        | dict | Dictionary with valid key/value pairs for                   |
-        |      | `matplotlib.rcParams`.                                      |
-        +------+-------------------------------------------------------------+
-        | Path | A path-like object which is a path to a style file.         |
-        +------+-------------------------------------------------------------+
-        | list | A list of style specifiers (str, Path or dict) applied from |
-        |      | first to last in the list.                                  |
-        +------+-------------------------------------------------------------+
+        str
+            The name of a style or a path/URL to a style file. For a list of
+            available style names, see `.style.available`.
+        dict
+            Dictionary with valid key/value pairs for `matplotlib.rcParams`.
+        Path
+            A path-like object which is a path to a style file.
+        list
+            A list of style specifiers (str, Path or dict) applied from first
+            to last in the list.
 
     after_reset : bool
         If True, apply style after resetting settings to their defaults;

lib/matplotlib/ticker.py

@@ -1520,17 +1520,14 @@ def format_pct(self, x, display_range):
         decimal point is set based on the *display_range* of the axis
         as follows:
 
-        +---------------+----------+------------------------+
-        | display_range | decimals |          sample        |
-        +---------------+----------+------------------------+
-        | >50           |     0    | ``x = 34.5`` => 35%    |
-        +---------------+----------+------------------------+
-        | >5            |     1    | ``x = 34.5`` => 34.5%  |
-        +---------------+----------+------------------------+
-        | >0.5          |     2    | ``x = 34.5`` => 34.50% |
-        +---------------+----------+------------------------+
-        |      ...      |    ...   |          ...           |
-        +---------------+----------+------------------------+
+        ============= ======== =======================
+        display_range decimals sample
+        ============= ======== =======================
+        >50           0        ``x = 34.5`` => 35%
+        >5            1        ``x = 34.5`` => 34.5%
+        >0.5          2        ``x = 34.5`` => 34.50%
+        ...           ...      ...
+        ============= ======== =======================
 
         This method will not be very good for tiny axis ranges or
         extremely large ones. It assumes that the values on the chart