Fix documentation typos

[mlrv]

Fix two small typos

this function have -> this function has
and perform better -> and performs better

[samhh]

Someone with a better formal understanding of English than me should verify this, but I also think that "behavior of" in all those examples should actually be "behavior as".

[mlrv]

Someone with a better formal understanding of English than me should verify this, but I also think that "behavior of" in all those examples should actually be "behavior as".

Right, it does sound better to me as well

[gcanti]

Thanks @mlrv