Minor fixes

pages/basic_customizations.rst

@@ -99,21 +99,9 @@ You can also set `explicit_size` to True to add size attributes to the svg tag.
 Scaling
 -------
 
-``x_scale, y_scale, include_x_axis``
+``include_x_axis``
-
-
-Indicate a hint for the scale computation:
-
-.. pygal-code::
-
-  chart = pygal.Line()
-  chart.add('line', [.0002, .0005, .00035])
-
-.. pygal-code::
-
-  chart = pygal.Line(y_scale=.0001)
-  chart.add('line', [.0002, .0005, .00035])
 
+Scales are computed automaticaly between the min and the max values.
 
 You may want to always have the absissa in your graph:
 

pages/documentation.rst

@@ -14,7 +14,7 @@ User documentation
 - `Other customizations </other_customizations>`_ - customize all the things.
 
 
-Developper documentation
+Developer documentation
-========================
+=======================
 
 - `Create a chart type </chart_creation>`_ - extend pygal.

pages/other_customizations.rst

@@ -23,6 +23,9 @@ You can set the scale to be logarithmic:
   chart.x_labels = map(str, values)
   chart.add('log example', values)
 
+.. caution::
+Negative values are ignored, interpolation might be broken if it goes below zero...
+
 
 Custom css and js
 -----------------