grammar fix

Author: Meghansaha

NEWS.md

@@ -1,6 +1,6 @@
 # dplyr (development version)
 
-* `bind_rows()` now replaces empty (or NA) element names in a list with it's
+* `bind_rows()` now replaces empty (or NA) element names in a list with its
    numeric index while preserving present names  (#7719, @Meghansaha).
 
 * Clarified how `slice_min()` and `slice_max()` work in the introduction vignette (#7717, @ccani007).