fix description of shares behavior

Fixes #615

glommio/src/lib.rs

@@ -107,7 +107,7 @@
 //!
 //! This example creates two task queues: `tq1` has 2 shares, `tq2` has 1 share.
 //! This means that if both want to use the CPU to its maximum, `tq1` will have
-//! `1/3` of the CPU time `(1 / (1 + 2))` and `tq2` will have `2/3` of the CPU
+//! `2/3` of the CPU time `(2 / (1 + 2))` and `tq2` will have `1/3` of the CPU
 //! time. Those shares are dynamic and can be changed at any time. Notice that
 //! this scheduling method doesn't prevent either `tq1` no `tq2` from using 100%
 //! of CPU time at times in which they are the only task queue running: the