Assorted spelling fixes in comments.

src/salloc/opt.h

@@ -178,7 +178,7 @@ typedef struct salloc_options {
 
 extern opt_t opt;
 extern int error_exit;		/* exit code for slurm errors */
-extern int immediate_exit;	/* exit code for --imediate option & busy */
+extern int immediate_exit;	/* exit code for --immediate option & busy */
 
 /* process options:
  * 1. set defaults

src/slurmd/slurmd/slurmd.c

@@ -366,7 +366,7 @@ main (int argc, char **argv)
 	if (slurmd_plugstack_init())
 		fatal("failed to initialize slurmd_plugstack");
 
-	/* Wait for a successfull health check if HealthCheckInterval != 0 */
+	/* Wait for a successful health check if HealthCheckInterval != 0 */
 	_wait_health_check();
 
 	_spawn_registration_engine();
@@ -2359,7 +2359,7 @@ static void _resource_spec_fini(void)
 /*
  * Wait for health check to execute successfully
  *
- * Return imediately if a shutdown has been requested or
+ * Return immediately if a shutdown has been requested or
  * if the HealthCheckInterval is 0.
  */
 static void _wait_health_check(void)

src/srun/libsrun/opt.h

@@ -248,7 +248,7 @@ typedef struct srun_options {
 extern opt_t opt;
 
 extern int error_exit;		/* exit code for slurm errors */
-extern int immediate_exit;	/* exit code for --imediate option & busy */
+extern int immediate_exit;	/* exit code for --immediate option & busy */
 extern bool srun_max_timer;
 extern bool srun_shutdown;
 extern time_t srun_begin_time;	/* begin time of srun process */