[SPARK-5806] re-organize sections in mllib-clustering.md

Put example code close to the algorithm description.

Author: Xiangrui Meng <meng@databricks.com>

Closes #4598 from mengxr/SPARK-5806 and squashes the following commits:

a137872 [Xiangrui Meng] re-organize sections in mllib-clustering.md

1 files changed, 5 insertions, 3 deletions

diff --git a/docs/mllib-guide.md b/docs/mllib-guide.md
index 3d32d03e35..5091dbf329 100644
--- a/docs/mllib-guide.md
+++ b/docs/mllib-guide.md
@@ -24,9 +24,11 @@ filtering, dimensionality reduction, as well as underlying optimization primitiv
 * [Collaborative filtering](mllib-collaborative-filtering.html)
   * alternating least squares (ALS)
 * [Clustering](mllib-clustering.html)
-  * k-means
-  * Gaussian mixture
-  * power iteration
+  * [k-means](mllib-clustering.html#k-means)
+  * [Gaussian mixture](mllib-clustering.html#gaussian-mixture)
+  * [power iteration clustering (PIC)](mllib-clustering.html#power-iteration-clustering-pic)
+  * [latent Dirichlet allocation (LDA)](mllib-clustering.html#latent-dirichlet-allocation-lda)
+  * [streaming k-means](mllib-clustering.html#streaming-k-means)
 * [Dimensionality reduction](mllib-dimensionality-reduction.html)
   * singular value decomposition (SVD)
   * principal component analysis (PCA)