CLEANUP: fix a few typos in the comments of the server subsystem

A few misspells where detected in the server subsystem. This commit
fixes them.
diff --git a/include/types/server.h b/include/types/server.h
index a2e11c3..9586fb8 100644
--- a/include/types/server.h
+++ b/include/types/server.h
@@ -272,7 +272,7 @@
 	struct dns_resolvers *resolvers;	/* pointer to the resolvers structure used by this server */
 	char *lastaddr;				/* the address string provided by the server-state file */
 	struct dns_options dns_opts;
-	int hostname_dn_len;			/* sting lenght of the server hostname in Domain Name format */
+	int hostname_dn_len;			/* sting length of the server hostname in Domain Name format */
 	char *hostname_dn;			/* server hostname in Domain Name format */
 	char *hostname;				/* server hostname */
 	struct sockaddr_storage init_addr;	/* plain IP address specified on the init-addr line */
@@ -322,7 +322,7 @@
 		short status, code;
 		char reason[128];
 	} op_st_chg;				/* operational status change's reason */
-	char adm_st_chg_cause[48];		/* adminstrative status change's cause */
+	char adm_st_chg_cause[48];		/* administrative status change's cause */
 };
 
 /* Descriptor for a "server" keyword. The ->parse() function returns 0 in case of
diff --git a/src/server.c b/src/server.c
index 5a539ef..9c5f4e9 100644
--- a/src/server.c
+++ b/src/server.c
@@ -1921,7 +1921,7 @@
  * Note that a server template is a special server with
  * a few different parameters than a server which has
  * been parsed mostly the same way as a server.
- * Returns the number of servers succesfully allocated,
+ * Returns the number of servers successfully allocated,
  * 'srv' template included.
  */
 static int server_template_init(struct server *srv, struct proxy *px)
@@ -2303,7 +2303,7 @@
 				p = args[cur_arg + 1];
 				e = p;
 				while (*p != '\0') {
-					/* If no room avalaible, return error. */
+					/* If no room available, return error. */
 					if (opt->pref_net_nb >= SRV_MAX_PREF_NET) {
 						ha_alert("parsing [%s:%d]: '%s' exceed %d networks.\n",
 						      file, linenum, args[cur_arg], SRV_MAX_PREF_NET);
@@ -3043,7 +3043,7 @@
 					 * - reload for any other reason than a FQDN modification,
 					 * the configuration file FQDN matches the fqdn server state file value.
 					 * So we must reset the 'set from stats socket FQDN' flag to be consistent with
-					 * any futher FQDN modification.
+					 * any further FQDN modification.
 					 */
 					srv->next_admin &= ~SRV_ADMF_HMAINT;
 				}