doc/ck_cohort: Various fixes to manual pages.

doc/CK_COHORT_INIT

@@ -28,7 +28,7 @@
 .Dt CK_COHORT_INIT 3
 .Sh NAME
 .Nm CK_COHORT_INIT
-.Nd Initialize an instance of a cohort type
+.Nd initialize instance of a cohort type
 .Sh LIBRARY
 Concurrency Kit (libck, \-lck)
 .Sh SYNOPSIS

doc/CK_COHORT_INSTANCE

@@ -28,7 +28,7 @@
 .Dt CK_COHORT_INSTANCE 3
 .Sh NAME
 .Nm CK_COHORT_INSTANCE
-.Nd Declare an instance of a cohort type
+.Nd declare an instance of a cohort type
 .Sh LIBRARY
 Concurrency Kit (libck, \-lck)
 .Sh SYNOPSIS

doc/CK_COHORT_LOCK

@@ -28,7 +28,7 @@
 .Dt CK_COHORT_LOCK 3
 .Sh NAME
 .Nm CK_COHORT_LOCK
-.Nd Acquire a cohort's locks
+.Nd acquire cohort lock
 .Sh LIBRARY
 Concurrency Kit (libck, \-lck)
 .Sh SYNOPSIS

doc/CK_COHORT_PROTOTYPE

@@ -28,7 +28,7 @@
 .Dt CK_COHORT_PROTOTYPE 3
 .Sh NAME
 .Nm CK_COHORT_PROTOTYPE
-.Nd Define a cohort type with the given lock types
+.Nd define cohort type with specified lock types
 .Sh LIBRARY
 Concurrency Kit (libck, \-lck)
 .Sh SYNOPSIS

doc/CK_COHORT_TRYLOCK

@@ -28,7 +28,7 @@
 .Dt CK_COHORT_TRYLOCK 3
 .Sh NAME
 .Nm CK_COHORT_TRYLOCK
-.Nd Try to acquire a cohort's locks
+.Nd try to acquire cohort lock
 .Sh LIBRARY
 Concurrency Kit (libck, \-lck)
 .Sh SYNOPSIS

doc/CK_COHORT_TRYLOCK_PROTOTYPE

@@ -28,7 +28,7 @@
 .Dt CK_COHORT_TRYLOCK_PROTOTYPE 3
 .Sh NAME
 .Nm CK_COHORT_TRYLOCK_PROTOTYPE
-.Nd Define a cohort type with the given lock types
+.Nd define cohort type with specified lock types
 .Sh LIBRARY
 Concurrency Kit (libck, \-lck)
 .Sh SYNOPSIS

doc/CK_COHORT_UNLOCK

@@ -28,7 +28,7 @@
 .Dt CK_COHORT_UNLOCK 3
 .Sh NAME
 .Nm CK_COHORT_UNLOCK
-.Nd Acquire a cohort's locks
+.Nd release cohort lock
 .Sh LIBRARY
 Concurrency Kit (libck, \-lck)
 .Sh SYNOPSIS