adds examples to docs

doc/source/examples.rst

@@ -15,6 +15,10 @@ You can run some examples for the functions in nolds with the command
 * ``hurst-hist`` plots a histogram of hurst exponents obtained for random noise.
 * ``hurst-nvals`` creates a plot that compares the results of different choices for nvals
   for the function ``hurst_rs``.
+* ``sampen-tol`` compares old and new default tolerance values for ``sampen``.
+* ``hurst_mf_stock`` example function recreates a plot from Di Matteo (2003).
+* ``barabasi_1991_figure2`` and ``barabasi_1991_figure3`` recreate the respective plots from Barabasi et al. (1991)
+* ``lorenz`` calculates all main measures of ``nolds`` for x, y, and z coordinates of a Lorenz plot and compares them to prescribed values from the literature.
 
 These tests are also available as functions inside the module ``nolds.examples``.