Update installation instructions

Author: borsboom

doc/install_and_upgrade.md

@@ -18,8 +18,6 @@ NOTE: These executables have been built and tested on a Windows 7, 8.1, and 10 6
 
 We generally test on the current version of OS X, but stack is known to work on Mavericks as well, and may also work on older versions (YMMV).
 
-**Note**: due to [GHC bug 10322](https://ghc.haskell.org/trac/ghc/ticket/10322), building `stack` from source fails with GHC 7.10.1. This bug is fixed in GHC 7.10.2, and GHC 7.8.4 works as well.
-
 ## Ubuntu
 
 *note*: for 32-bit, use the [generic Linux option](#linux)
@@ -175,4 +173,4 @@ There are essentially three different approaches to upgrade:
 
 * If you're using a package manager (e.g., the Ubuntu debs listed above) and are happy with sticking with the officially released binaries, simply follow your normal package manager strategies for upgrading (e.g. `apt-get update && apt-get upgrade`).
 * If you're not using a package manager but want to stick with the official binaries (such as on Windows or Mac), you'll need to manually follow the steps above to download the newest binaries from the release page and replace the old binary.
-* The `stack` tool itself ships with an `upgrade` command, which will build `stack` from source and install it to the default install path (see the previous section). You can use `stack upgrade` to get the latest official release, and `stack upgrade --git` to install from Git and leave on the bleeding edge. If you follow this, make sure that this directory is on your `PATH` and takes precedence over the system installed `stack`. For more information, see [this discussion](https://github.com/commercialhaskell/stack/issues/237#issuecomment-126793301).
+* The `stack` tool itself ships with an `upgrade` command, which will build `stack` from source and install it to the default install path (see the previous section). You can use `stack upgrade` to get the latest official release, and `stack upgrade --git` to install from Git and leave on the bleeding edge. If you follow this, make sure that this directory is on your `PATH` and takes precedence over the system installed `stack`. For more information, see [this discussion](https://github.com/commercialhaskell/stack/issues/237#issuecomment-126793301).