example docstring fixes

examples/cluster/plot_lena_compress.py

@@ -5,6 +5,7 @@
 =========================================================
 Vector Quantization Example
 =========================================================
+
 The classic image processing example, Lena, an 8-bit grayscale
 bit-depth, 512 x 512 sized image, is used here to illustrate
 how `k`-means is used for vector quantization.

examples/decomposition/plot_pca_iris.py

@@ -6,6 +6,11 @@
 PCA example with Iris Data-set
 =========================================================
 
+Principal Component Analysis applied to the Iris dataset.
+
+See `here <http://en.wikipedia.org/wiki/Iris_flower_data_set>`_ for more
+information on this dataset.
+
 """
 print(__doc__)
 

examples/linear_model/plot_logistic.py

@@ -6,6 +6,7 @@
 =========================================================
 Logit function
 =========================================================
+
 Show in the plot is how the logistic regression would, in this
 synthetic dataset, classify values as either 0 or 1,
 i.e. class one or two, using the logit-curve.

examples/svm/plot_svm_kernels.py

@@ -5,6 +5,7 @@
 =========================================================
 SVM-Kernels
 =========================================================
+
 Three different types of SVM-Kernels are displayed below.
 The polynomial and RBF are especially useful when the
 data-points are not linearly seperable.