update the docstring to refer to splice sites everywhere instead of i…

…ntrons

gffutils/interface.py

@@ -1280,37 +1280,37 @@ def create_splice_sites(
  numeric_sort=False,
  ):
  """
- Create introns from existing annotations.
+ Create splice sites from existing annotations.
 
 
  Parameters
  ----------
  exon_featuretype : string
- Feature type to use in order to infer introns. Typically `"exon"`.
+ Feature type to use in order to infer splice sites. Typically `"exon"`.
 
  grandparent_featuretype : string
  If `grandparent_featuretype` is not None, then group exons by
  children of this featuretype. If `granparent_featuretype` is
- "gene" (default), then introns will be created for all first-level
+ "gene" (default), then splice sites will be created for all first-level
  children of genes. This may include mRNA, rRNA, ncRNA, etc. If
- you only want to infer introns from one of these featuretypes
+ you only want to infer splice sites from one of these featuretypes
  (e.g., mRNA), then use the `parent_featuretype` kwarg which is
  mutually exclusive with `grandparent_featuretype`.
 
  parent_featuretype : string
  If `parent_featuretype` is not None, then only use this featuretype
- to infer introns. Use this if you only want a subset of
- featuretypes to have introns (e.g., "mRNA" only, and not ncRNA or
+ to infer splice sites. Use this if you only want a subset of
+ featuretypes to have splice sites (e.g., "mRNA" only, and not ncRNA or
  rRNA). Mutually exclusive with `grandparent_featuretype`.
 
  merge_attributes : bool
  Whether or not to merge attributes from all exons. If False then no
- attributes will be created for the introns.
+ attributes will be created for the splice sites.
 
  numeric_sort : bool
  If True, then merged attributes that can be cast to float will be
  sorted by their numeric values (but will still be returned as
- string). This is useful, for example, when creating introns between
+ string). This is useful, for example, when creating splice sites between
  exons and the exons have exon_number attributes as an integer.
  Using numeric_sort=True will ensure that the returned exons have
  merged exon_number attribute of ['9', '10'] (numerically sorted)
@@ -1319,15 +1319,15 @@ def create_splice_sites(
  Returns
  -------
  A generator object that yields :class:`Feature` objects representing
- new introns
+ new splice sites
 
  Notes
  -----
  The returned generator can be passed directly to the
  :meth:`FeatureDB.update` method to permanently add them to the
  database, e.g., ::
 
- db.update(db.create_introns())
+ db.update(db.create_splice sites())
 
  """
  if (grandparent_featuretype and parent_featuretype) or (