DOC Document {fpkm} normalization

This was missing even though it has been supported since NGLess 0.5
ngless-toolkit · Jan 20, 2021 · e1bd1b7 · e1bd1b7
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diff --git a/docs/sources/Functions.rst b/docs/sources/Functions.rst
@@ -613,6 +613,8 @@ argument to True.
   feature
 - ``{scaled}`` is the result of the ``{normed}`` mode scaled up so that the
   total number of counts is identical to the ``{raw}`` (within rounding error)
+- ``{fpkm}`` is *fragments per 1000 bp per million fragments*, so it is normalized
+  by both the size of the feature and the number of fragments.
 
 Unmapped inserts are included in the output if ``{include_minus1}`` is true
 (default: ``False``).