DOC: tweak ecosystem section

Author: y-p

doc/source/ecosystem.rst

@@ -35,7 +35,7 @@ plots (that in turn, leverages `d3 <http://d3js.org/>`__). It has great support
 `yhat/ggplot <https://github.com/yhat/ggplot>`__
 -----------
 
-Hadley Wickham's `ggplot2 <http://ggplot2.org/>`__is a foundational exploratory visualization package for the R language.
+Hadley Wickham's `ggplot2 <http://ggplot2.org/>`__ is a foundational exploratory visualization package for the R language.
 Based on `"The Grammer of Graphics" <http://www.cs.uic.edu/~wilkinson/TheGrammarOfGraphics/GOG.html>`__ it
 provides a powerful, declarative and extremely general way to generate plots of arbitrary data.
 It's really quite incredible. Various implementations to other languages are available,