Grammar fix (apache#7622)

fredster33 · web-flow · commit cf2abc8e08dc · 2021-03-10T18:46:04.000-05:00
diff --git a/README.md b/README.md
@@ -36,7 +36,7 @@ License
 Contribute to TVM
 -----------------
 TVM adopts apache committer model, we aim to create an open source project that is maintained and owned by the community.
-Checkout the [Contributor Guide](https://tvm.apache.org/docs/contribute/)
+Check out the [Contributor Guide](https://tvm.apache.org/docs/contribute/).
 
 Acknowledgement
 ---------------
