Merge pull request #322 from mkcor/patch-2

Prefix functions used for customising plots.

Author: uschille

episodes/05-creating-histograms.md

@@ -450,7 +450,7 @@ ax.set_ylabel("pixel count")
 - In many cases, we can load images in grayscale by passing the `mode="L"` argument to the `iio.imread()` function.
 - We can create histograms of images with the `np.histogram` function.
 - We can display histograms using `ax.plot()` with the `bin_edges` and `histogram` values returned by `np.histogram()`.
-- The plot can be customised using `set_xlabel()`, `set_ylabel()`, `set_xlim()`, `set_ylim()`, and `set_title()`.
+- The plot can be customised using `ax.set_xlabel()`, `ax.set_ylabel()`, `ax.set_xlim()`, `ax.set_ylim()`, and `ax.set_title()`.
 - We can separate the colour channels of an RGB image using slicing operations and create histograms for each colour channel separately.
 
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