Merge tag 'doc-4.8-fixes' of git://git.lwn.net/linux

Pull documentation fixes from Jonathan Corbet:
 "Three fixes for the docs build, including removing an annoying warning
  on 'make help' if sphinx isn't present"

* tag 'doc-4.8-fixes' of git://git.lwn.net/linux:
  DocBook: use DOCBOOKS="" to ignore DocBooks instead of IGNORE_DOCBOOKS=1
  Documenation: update cgroup's document path
  Documentation/sphinx: do not warn about missing tools in 'make help'

Documentation/vm/numa

@@ -63,7 +63,7 @@ nodes.  Each emulated node will manage a fraction of the underlying cells'
 physical memory.  NUMA emluation is useful for testing NUMA kernel and
 application features on non-NUMA platforms, and as a sort of memory resource
 management mechanism when used together with cpusets.
-[see Documentation/cgroups/cpusets.txt]
+[see Documentation/cgroup-v1/cpusets.txt]
 
 For each node with memory, Linux constructs an independent memory management
 subsystem, complete with its own free page lists, in-use page lists, usage
@@ -113,7 +113,7 @@ allocation behavior using Linux NUMA memory policy.
 
 System administrators can restrict the CPUs and nodes' memories that a non-
 privileged user can specify in the scheduling or NUMA commands and functions
-using control groups and CPUsets.  [see Documentation/cgroups/cpusets.txt]
+using control groups and CPUsets.  [see Documentation/cgroup-v1/cpusets.txt]
 
 On architectures that do not hide memoryless nodes, Linux will include only
 zones [nodes] with memory in the zonelists.  This means that for a memoryless

Documentation/vm/numa_memory_policy.txt

@@ -9,7 +9,7 @@ document attempts to describe the concepts and APIs of the 2.6 memory policy
 support.
 
 Memory policies should not be confused with cpusets
-(Documentation/cgroups/cpusets.txt)
+(Documentation/cgroup-v1/cpusets.txt)
 which is an administrative mechanism for restricting the nodes from which
 memory may be allocated by a set of processes. Memory policies are a
 programming interface that a NUMA-aware application can take advantage of.  When

Documentation/vm/page_migration

@@ -38,7 +38,7 @@ locations.
 Larger installations usually partition the system using cpusets into
 sections of nodes. Paul Jackson has equipped cpusets with the ability to
 move pages when a task is moved to another cpuset (See
-Documentation/cgroups/cpusets.txt).
+Documentation/cgroup-v1/cpusets.txt).
 Cpusets allows the automation of process locality. If a task is moved to
 a new cpuset then also all its pages are moved with it so that the
 performance of the process does not sink dramatically. Also the pages

Documentation/vm/unevictable-lru.txt

@@ -122,7 +122,7 @@ MEMORY CONTROL GROUP INTERACTION
 --------------------------------
 
 The unevictable LRU facility interacts with the memory control group [aka
-memory controller; see Documentation/cgroups/memory.txt] by extending the
+memory controller; see Documentation/cgroup-v1/memory.txt] by extending the
 lru_list enum.
 
 The memory controller data structure automatically gets a per-zone unevictable