Update src/tfidf_transformer.jl - spacing

Co-authored-by: Jose Storopoli <[email protected]>

Author: pazzo83

src/tfidf_transformer.jl

@@ -36,7 +36,7 @@ zero divisions: `idf(t) = log [ (1 + n) / (1 + df(t)) ] + 1`.
 
 The parameters `max_doc_freq` and `min_doc_freq` restrict the vocabulary
 that the transformer will consider. `max_doc_freq` indicates that terms in only
-up to the specified percentage of documents will be considered.  For example, if
+up to the specified percentage of documents will be considered. For example, if
 `max_doc_freq` is set to 0.9, terms that are in more than 90% of documents
 will be removed.  Similarly, the `min_doc_freq` parameter restricts terms in the
 other direction.  A value of 0.01 means that only terms that are at least in 1% of