Add unicode tag to text tutorial

[Efnilite]

Adds a description on how to use the unicode tag to the text tutorial.

[sovdeeth]

don't forget to add an entry to the table of tags

[Efnilite]

you mean the ones for links? i feel those are different as it says that

Skript also supports certain newer features, which are only available in chat.

which may make users think that they only work in chat messages

[sovdeeth]

you mean the ones for links? i feel those are different as it says that

Skript also supports certain newer features, which are only available in chat.

which may make users think that they only work in chat messages

good point