helpers: fix minor doc issues at ufid.h
* the lowest 29 bits of process FID are unique for each client instance.
*
* FID Format:
- * ---------------------------
+ * -----------
*
* 127 91|90 80|79 49|48 20|19 0
* +---------------+-------+---------------+---------------+-------------+
* | Motr | Salt | Generation ID | Process ID | Sequence ID |
* +---------------+-------+---------------+---------------+-------------+
- * 37 Bits |11 Bits| 31 Bits | 29 Bits | 20 Bit |
- *
+ * | 37 Bits |11 Bits| 31 Bits | 29 Bits | 20 Bit |
+ * +---------------+-------+---------------+---------------+-------------+
*
* Notes:
* (1) Salt: 11 bits of random number which is set when UFID is initialised.
* (2) Generation ID: it is taken from timestep (epoch) represented with 31
- * bits. A new generation ID is set when UFID is initialised or sequence
+ * bits. A new generation ID is set when UFID is initialised or Sequence
* ID rolls over 20 bits.
* (3) Process ID: client instance process ID. Each client instance is assigned
* a cluster-wide unique FID by Halon and the lowest 29 bits of FID is used
* int rc;
* struct m0_uint128 id128 = M0_UINT128(0, 0);
*
- * rc = m0_ufid_next(m0c, 1, &id128);
+ * rc = m0_ufid_next(&ufid_gr, 1, &id128);
* if (rc < 0)
* printf("m0_ufid_next() returned error: %d", rc);
* }
* int rc;
* struct m0_uint128 id128 = M0_UINT128(0, 0);
*
- * rc = m0_ufid_new(m0c, 100, 100, &id128);
+ * rc = m0_ufid_new(&ufid_gr, 100, 100, &id128);
* if (rc < 0)
* printf("m0_ufid_new() returned error: %d", rc);
* }
