update 'in-place updates' section of documentation
this patch removes a now-invalid warning about using `gopass insert`
to update existing entries in the store. additionally, a minor
syntatical error was fixed in the same section.
the removed warning was fixed by
closes
@@ -364,11 +364,8 @@ strength of generated passwords.
### In-place updates to existing passwords
-Running `gopass generate foo/bar` on an existing entry `foo/bar` will only update
-the first line of the secret leaving and trailing data in place.
-
-WARNING: At the moment this differs from the behaviour of `gopass insert` which
-will overwrite the whole entry. We [plan to fix this](https://github.com/justwatchcom/gopass/issues/301).
+Running `gopass [generate|insert] foo/bar` on an existing entry `foo/bar` will only update
+the first line of the secret, leaving any trailing data in place.
### Disabling Colors
