Update exercises/practice/rna-transcription/.approaches/dictionary-join/content.md

Co-authored-by: András B Nagy <20251272+BNAndras@users.noreply.github.com>

Author: petrem

exercises/practice/rna-transcription/.approaches/dictionary-join/content.md

@@ -21,7 +21,7 @@ and is passed the list created from a [generator expression][generator-expressio
 The generator expression iterates each character in the input,
 looks up the DNA character in the look-up dictionary, and outputs its matching RNA character as an element in the list.
 
-The `join()` method collects the RNA characters back into a string.
+The `join()` method collects the RNA characters into a string.
 Since an empty string is the separator for the `join()`, there are no spaces between the RNA characters in the string.
 
 A generator expression is similar to a [list comprehension][list-comprehension], but instead of creating a list, it returns a generator, and iterating that generator yields the elements on the fly.