attempt to fix doc build facebookresearch#1363

Summary: installing from git: is failing

Reviewed By: shapovalov

Differential Revision: D40635668

fbshipit-source-id: 604ba5425e14caeabe4e178bf7f851f2163419bd

Author: bottler

docs/requirements.txt

@@ -5,7 +5,7 @@ sphinx_rtd_theme
 sphinx_markdown_tables
 mock
 numpy
-git+git://github.com/facebookresearch/fvcore.git
-git+git://github.com/facebookresearch/iopath.git
+iopath
+fvcore
 https://download.pytorch.org/whl/cpu/torchvision-0.8.2%2Bcpu-cp37-cp37m-linux_x86_64.whl
 https://download.pytorch.org/whl/cpu/torch-1.7.1%2Bcpu-cp37-cp37m-linux_x86_64.whl