Updated ROCm-docs to match the current status of the repository (#117)

* Updated docs to match the current status of the repository

Co-authored-by: yugang-amd <yugang.wang@amd.com>

docs/api/init.rst

@@ -53,6 +53,45 @@ This routine finalizes device-side rocSHMEM resources.
 It must be called before work-group completion if the work-group also called ``rocshmem_wg_init``.
 It must be called collectively by all threads in the work-group.
 
+ROCSHMEM_INIT_ATTR
+------------------
+.. cpp:function:: __host__ int rocshmem_init_attr(unsigned int flags, rocshmem_init_attr_t *attr)
+
+  :param flags: The initialization method to be used.
+  :param attr:  Attribute structure specifying input characteristics.
+
+  :returns int: Returns ``0`` on success; otherwise, returns a nonzero value.
+
+**Description:**
+This routine initializes the rocSHMEM runtime and underlying transport layer using
+the provided mode and attributes.
+The parameter ``flags`` can be either 
+``ROCSHMEM_INIT_WITH_UNIQUEID`` or ``ROCSHMEM_INIT_WITH_MPI_COMM``.
+
+ROCSHMEM_GET_UNIQUEID
+---------------------
+.. cpp:function:: __host__ int rocshmem_get_uniqueid(rocshmem_uniqueid_t *uid)
+
+  :param uid: Pointer to a unique ID handle.
+  :returns:   Returns ``0`` on success; otherwise, returns a nonzero value.
+
+**Description:**
+This routine returns a unique ID.
+
+ROCSHMEM_SET_ATTR_UNIQUEID_ARGS
+-------------------------------
+.. cpp:function:: __host__ int rocshmem_set_attr_uniqueid_args(int rank, int nranks, rocshmem_uniqueid_t *uid, rocshmem_init_attr_t *attr)
+
+  :param rank:   Rank of the calling process.
+  :param nranks: Number of PEs.
+  :param uid:    Unique ID used to identify the group processes.
+  :param attr:   Attribute structure to be passed to ``rocshmem_init_attr_t``.
+
+  :returns:      Returns ``0`` on success; otherwise, returns a nonzero value.
+
+**Description:**
+This routine initializes the ``rocshmem_init_attr_t`` struct.
+
 ROCSHMEM_N_PES
 --------------