Do not use space in directive calling.

This is non standard, and does not work with all rst parsers.
And those are the only few while there is approximatively 1200 directive
that don't use space in the codebase

Author: Carreau

lib/matplotlib/axes/_base.py

@@ -4215,7 +4215,7 @@ def set_navigate_mode(self, b):
         """
         Set the navigation toolbar button status.
 
-        .. warning ::
+        .. warning::
             this is not a user-API function.
 
         """

lib/matplotlib/cm.py

@@ -299,7 +299,7 @@ def unregister_cmap(name):
     If the named colormap is not registered, returns with no error, raises
     if you try to de-register a default colormap.
 
-    .. warning ::
+    .. warning::
 
       Colormap names are currently a shared namespace that may be used
       by multiple packages. Use `unregister_cmap` only if you know you

lib/matplotlib/figure.py

@@ -1674,7 +1674,7 @@ def subplot_mosaic(self, mosaic, *, sharex=False, sharey=False,
 
         This is a helper function to build complex GridSpec layouts visually.
 
-        .. note ::
+        .. note::
 
            This API is provisional and may be revised in the future based on
            early user feedback.

lib/matplotlib/pyplot.py

@@ -1442,7 +1442,7 @@ def subplot_mosaic(mosaic, *, sharex=False, sharey=False,
 
     This is a helper function to build complex GridSpec layouts visually.
 
-    .. note ::
+    .. note::
 
        This API is provisional and may be revised in the future based on
        early user feedback.

tutorials/text/mathtext.py

@@ -111,7 +111,7 @@
 
     r'$(\frac{5 - \frac{1}{x}}{4})$'
 
-.. math ::
+.. math::
 
     (\frac{5 - \frac{1}{x}}{4})
 
@@ -120,7 +120,7 @@
 
     r'$\left(\frac{5 - \frac{1}{x}}{4}\right)$'
 
-.. math ::
+.. math::
 
     \left(\frac{5 - \frac{1}{x}}{4}\right)
 
@@ -130,7 +130,7 @@
 
     r'$\sqrt{2}$'
 
-.. math ::
+.. math::
 
     \sqrt{2}
 
@@ -140,7 +140,7 @@
 
     r'$\sqrt[3]{x}$'
 
-.. math ::
+.. math::
 
     \sqrt[3]{x}