Update src/tfidf_transformer.jl - spacing

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

Author: pazzo83

src/tfidf_transformer.jl

@@ -39,7 +39,7 @@ 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
 `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
+other direction. A value of 0.01 means that only terms that are at least in 1% of
 documents will be included.
 """
 mutable struct TfidfTransformer <: AbstractTextTransformer