man/fi_endpoint: regulate the usage of optname

FI_OPT_SHARED_MEMORY_PERMITTED is used to enforce
an endpoint to NOT use shm in the data transfer.
It should only apply to the fi_setopt call, in
the same model of FI_OPT_CUDA_API_PERMITTED.

Signed-off-by: Shi Jin <[email protected]>

Author: shijin-aws

man/fi_endpoint.3.md

@@ -537,7 +537,8 @@ The following option levels and option names and parameters are defined.
   All providers that support FI_HMEM capability implement this option.
 
 - *FI_OPT_SHARED_MEMORY_PERMITTED - bool*
-: This option controls the use of shared memory for intra-node communication.
+: This option only applies to the fi_setopt call.
+  This option controls the use of shared memory for intra-node communication.
   Setting it to true will allow the use of shared memory. When set to false,
   shared memory will not be used and the implementation of intra-node communication
   is provider dependent.