docs($routeProvider): correct "slashs" to "slashes"

Closes #6415
docs(tutorial): referenced e2e-test.bat for Windows users in step 3

Closes #5755
docs($interpolate) fix sample code appearing unformatted

Closes #6418
chore(core): introduce a wrapper for requestAnimationFrame
chore(core): create a wrapper to manage async callbacks
perf($animate): use rAF instead of timeouts to issue animation callbacks
docs(guide/concepts): reference correct module name.

Fixed a mistake, changed invoice to invoice2.

Closes #6438