namespaces.7: srcfix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man7/namespaces.7

@@ -36,6 +36,9 @@ One use of namespaces is to implement containers.
 This page describes the various namespaces and the associated
 .I /proc
 files, and summarizes the APIs for working with namespaces.
+.\"
+.\" ==================== The namespaces API ====================
+.\"
 .SS The namespaces API
 As well as various
 .I /proc
@@ -86,6 +89,9 @@ in most cases requires the
 capability.
 User namespaces are the exception: since Linux 3.8,
 no privilege is required to create a user namespace.
+.\"
+.\" ==================== The /proc/[pid]/ns/ directory ====================
+.\"
 .SS The /proc/[pid]/ns/ directory
 Each process has a 
 .IR /proc/[pid]/ns/
@@ -163,6 +169,9 @@ This file is a handle for the user namespace of the process.
 .TP
 .IR /proc/[pid]/ns/uts " (since Linux 3.0)"
 This file is a handle for the IPC namespace of the process.
+.\"
+.\" ==================== IPC namespaces ====================
+.\"
 .SS IPC namespaces (CLONE_NEWIPC)
 IPC namespaces isolate certain IPC resources,
 namely, System V IPC objects (see
@@ -189,6 +198,9 @@ all IPC objects in the namespace are automatically destroyed.
 Use of IPC namespaces requires a kernel that is configured with the
 .B CONFIG_IPC_NS
 option.
+.\"
+.\" ==================== Network namespaces ====================
+.\"
 .SS Network namespaces (CLONE_NEWNET)
 Network namespaces provide isolation of the system resources associated
 with networking: network devices, IP addresses, IP routing tables,
@@ -220,6 +232,9 @@ initial network namespace (not to the parent of the process).
 Use of network namespaces requires a kernel that is configured with the
 .B CONFIG_NET_NS
 option.
+.\"
+.\" ==================== Mount namespaces ====================
+.\"
 .SS Mount namespaces (CLONE_NEWNS)
 Mount namespaces isolate the set of file system mount points,
 meaning that processes in different mount namespaces can
@@ -279,6 +294,9 @@ Optional statistics and configuration information.
 Currently (as at Linux 2.6.26), only NFS file systems export
 information via this field.
 .RE
+.\"
+.\" ==================== PID namespaces ====================
+.\"
 .SS PID namespaces (CLONE_NEWPID)
 PID namespaces isolate the process ID number space,
 meaning that processes in different PID namespaces can have the same PID.
@@ -466,6 +484,9 @@ the receiving process's PID namespace.
 Use of PID namespaces requires a kernel that is configured with the
 .B CONFIG_PID_NS
 option.
+.\"
+.\" ==================== User namespaces ====================
+.\"
 .SS User namespaces (CLONE_NEWUSER)
 User namespaces isolate security-related identifiers, in particular,
 user IDs, group IDs, keys (see
@@ -723,10 +744,13 @@ the set-user-ID (set-group-ID) bit is silently ignored:
 the new program is executed,
 but the process's effective user (group) ID is left unchanged.
 (This mirrors the semantics of executing a set-user-ID or set-group-ID
-program that resides on a filesystem that was mounted with the
+program that resides on a file system that was mounted with the
 .BR MS_NOSUID
 flag (see 
 .BR mount (2).)
+.\"
+.\" ==================== UTS namespaces ====================
+.\"
 .SS UTS namespaces (CLONE_NEWUTS)
 UTS namespaces provide isolation of two system identifiers:
 the hostname and the NIS domain name.