Fix double spaces in doc blocks.

src/Collection/Iterator/FilterIterator.php

@@ -60,7 +60,7 @@ class FilterIterator extends Collection
     /**
      * {@inheritDoc}
      *
-     * We perform here some  strictness analysis so that the
+     * We perform here some strictness analysis so that the
      * iterator logic is bypassed entirely.
      *
      * @return \Iterator

src/Collection/Iterator/ReplaceIterator.php

@@ -73,7 +73,7 @@ class ReplaceIterator extends Collection
     /**
      * {@inheritDoc}
      *
-     * We perform here some  strictness analysis so that the
+     * We perform here some strictness analysis so that the
      * iterator logic is bypassed entirely.
      *
      * @return \Iterator

src/Collection/Iterator/StoppableIterator.php

@@ -84,7 +84,7 @@ class StoppableIterator extends Collection
     /**
      * {@inheritDoc}
      *
-     * We perform here some  strictness analysis so that the
+     * We perform here some strictness analysis so that the
      * iterator logic is bypassed entirely.
      *
      * @return \Iterator