time: move the explanation of u/micro to the ParseDuration example
time: move the explanation of u/micro to the ParseDuration example

Fix a few missing capitalizations in drive-by.

Change-Id: I7353c12f3ccddefc0f26a98590caf9e446129558
Reviewed-on: https://go-review.googlesource.com/c/163918
Run-TryBot: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

CAFxX/go,nawawi/go,cloudflare/go,cloudflare/go,nawawi/go,nawawi/go,akutz/go,akutz/go,nawawi/go,akutz/go,josharian/go,akutz/go,josharian/go,golang/go,josharian/go,cloudflare/go,CAFxX/go,nawawi/go,nawawi/go,josharian/go,akutz/go,CAFxX/go,CAFxX/go,golang/go,golang/go,CAFxX/go,cloudflare/go,josharian/go,nawawi/go,josharian/go,CAFxX/go,cloudflare/go,josharian/go,golang/go,akutz/go,golang/go,akutz/go,nawawi/go,golang/go,cloudflare/go,golang/go,cloudflare/go,akutz/go,CAFxX/go,cloudflare/go,CAFxX/go,josharian/go,golang/go