Update posts/specfile-advanced/index.md

Co-authored-by: František Lachman <[email protected]>

Author: nforro

posts/specfile-advanced/index.md

@@ -239,7 +239,7 @@ The algorithm isn't perfect and won't work in all situations, but even if it's n
 some macro definitions it is guaranteed that `expanded_value` of a tag after calling `update_tag()`
 will be equal to the given value.
 
-There is also more general method `Specfile.update_value()` that allows to you update any string
+There is also a more general method `Specfile.update_value()` that allows you to update any string
 within a spec file in the same manner, trying to preserve macro substitutions and update relevant
 macro definitions (or even tag values in case of e.g. `%{version}`) if possible. It is up to you
 to replace the original string with the result (that can but doesn't have to be exactly the same).