typos

SETUP.md

@@ -52,7 +52,7 @@ git clone https://github.com/PixarAnimationStudios/OpenUSD.git
 python3 OpenUSD/build_scripts/build_usd.py $BUILD_DESTINATION
 ```
 
-## Set Up Envionment
+## Set Up Environment
 
 Example script to set up the environment. 
 
@@ -130,15 +130,15 @@ If following directly the REPL check in the same shell session the below should
 
 `usdview HelloWorld.usda`
 
-# USDZ Tools
+## USDZ Tools
 
 The USDZ scripts work better when run using a fresh build of the Pixar tools in the path instead of the included build and then running the script with that build's preferred python explicitly: e.g. `python3 /Applications/usdpython/usdzconvert/usdARKitChecker -v three_d_thing.usda`
 
 TODO: Boost may have to be updated/altered to get all of the samples to run. What is the PIL module? 
 
 ## Tips on using different version of Python
 
-## pyenv
+### pyenv
 
 <https://github.com/pyenv/pyenv>
 
@@ -180,4 +180,3 @@ cd $DIRECTORY_WITH_CLONED_REPO
 python3 OpenUSD/build_scripts/build_usd.py $BUILD_DESTINATION 
 ```
 
-