[SPARK-15305][ML][DOC] spark.ml document Bisectiong k-means has the incorrect format
[SPARK-15305][ML][DOC] spark.ml document Bisectiong k-means has the incorrect format

## What changes were proposed in this pull request?

(Please fill in changes proposed in this fix)
The generated document has the incorrect format for biseckmeans.

![bug](https://cloud.githubusercontent.com/assets/5033592/15233120/d910098a-185a-11e6-901d-44aeafc8a011.jpg)

## How was this patch tested?

(Please explain how this patch was tested. E.g. unit tests, integration tests, manual tests)

Fix the formatting.
![fix](https://cloud.githubusercontent.com/assets/5033592/15233136/fce2ccd0-185a-11e6-9ded-14d71da4bdab.jpg)

Author: wm624@hotmail.com <wm624@hotmail.com>

Closes #13083 from wangmiao1981/doc.

(cherry picked from commit c1836d66bdc93f80ff9e8852efe8f2d2bc1ca941)
Signed-off-by: Nick Pentreath <6fe12bfdafd6d3c41da5ad6593c53ed449c85282@za.ibm.com>

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