Spelling fixes

* appropriate
* assumption
* attach
* because
* building
* customized
* mapping
* propagated

Signed-off-by: Josh Soref <jsoref@gmail.com>

dockerfiles/osx-cross.sh

@@ -25,5 +25,5 @@ echo "Downloading OSX SDK"
 time curl -sSL https://s3.dockerproject.org/darwin/v2/${OSX_SDK}.tar.xz \
     -o "${OSXCROSS_PATH}/tarballs/${OSX_SDK}.tar.xz"
 
-echo "Buidling osxcross"
+echo "Building osxcross"
 UNATTENDED=yes OSX_VERSION_MIN=10.6 ${OSXCROSS_PATH}/build.sh > /dev/null