Update conf.py

Author: mcbarton

docs/conf.py

@@ -57,8 +57,7 @@
                 {0}/emsdk/emsdk install  3.1.73;\
                 {0}/emsdk/emsdk activate 3.1.73;\
                 cd {0}/emsdk/;\
-                ls;\
-                . emsdk_env.sh;\
+                export PATH="{0}/emsdk/upstream/emscripten:$PATH;\
                 export SYSROOT_PATH={0}/emsdk/upstream/emscripten/cache/sysroot;\
                 git clone --depth=1 --branch release/20.x https://github.com/llvm/llvm-project.git {0}/llvm-project;\
                 cd {0}/llvm-project;\