Fixing sentence case for sections, adding info to empty note

Author: mattymo30

galleries/users_explain/figure/figure_intro.rst

@@ -80,6 +80,8 @@ other than the default "inline" backend, you will likely need to use an ipython
 
    .. sourcecode:: ipython
 
+   %matplotlib notebook
+
 Standalone scripts and interactive use
 --------------------------------------
 

galleries/users_explain/figure/interactive.rst

@@ -7,7 +7,7 @@
 .. _interactive_figures:
 
 ===================
-Interactive Figures
+Interactive figures
 ===================
 
 When working with data, interactivity can be invaluable. The pan/zoom and
@@ -62,7 +62,7 @@ collected. `.Figure`\s can be closed and deregistered from `.pyplot` individuall
 
 .. _ipython-pylab:
 
-IPython Integration
+IPython integration
 ===================
 
 We recommend using IPython for an interactive shell.  In addition to
@@ -314,7 +314,7 @@ Preserve aspect ratio              hold **CONTROL** when panning/zooming with mo
 
 .. _other-shells:
 
-Other Python Prompts
+Other Python prompts
 ====================
 
 Interactive mode works in the default Python prompt: