Documentation updates for NCCL 2.7.0 (#219)

* Making hip-clang the default compiler; documentation update

* Adding back --hip-clang to install.sh as a silent option for CI

* Documentation updates for NCCL 2.7

* Restoring deleted line in install script

docs/source/api.rst

@@ -27,7 +27,7 @@ Communicator Functions
 
 .. doxygenfunction:: ncclCommUserRank
 
-Collection Communication Operations
+Collective Communication Operations
 -----------------------------------
 
 Collective communication operations must be called separately for each communicator in a communicator clique.
@@ -48,6 +48,15 @@ Since they may perform inter-CPU synchronization, each call has to be done from
 
 .. doxygenfunction:: ncclAllGather
 
+.. doxygenfunction:: ncclSend
+
+.. doxygenfunction:: ncclRecv
+
+.. doxygenfunction:: ncclGather
+
+.. doxygenfunction:: ncclScatter
+
+.. doxygenfunction:: ncclAllToAll
 
 Group Semantics
 ---------------