s390_guarded_storage.2: Minor fixes

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

man2/s390_guarded_storage.2

@@ -5,13 +5,13 @@ s390_guarded_storage \- operations with z/Architecture guarded storage facility
 .nf
 .B #include <asm/guarded_storage.h>
 .PP
-.BI "int s390_guarded_storage(int " command ", stuct gs_cb *" gs_cb ");"
+.BI "int s390_guarded_storage(int " command ", struct gs_cb *" gs_cb ");"
 .fi
 .SH DESCRIPTION
 The
 .BR s390_guarded_storage ()
 system call enables the use of the Guarded Storage Facility
-(a z/Architecture-specific feature) for user space processes.
+(a z/Architecture-specific feature) for user-space processes.
 .PP
 .\" The description is based on
 .\" http://www-05.ibm.com/de/linux-on-z-ws-us/agenda/pdfs/8_-_Linux_Whats_New_-_Stefan_Raspl.pdf
@@ -21,7 +21,7 @@ The guarded storage facility is a hardware feature that allows marking up to
 64 memory regions (as of z14) as guarded;
 reading a pointer with a newly introduced "Load Guarded" (LGG) or "Load Logical
 and Shift Guarded" (LLGFSG) instructions will cause a range check on the loaded
-value and invoke a (previously set up) user space handler if one of the guarded
+value and invoke a (previously set up) user-space handler if one of the guarded
 regions is affected.
 .PP
 The
@@ -31,19 +31,19 @@ argument indicates which function to perform.
 The following commands are supported:
 .TP
 .B GS_ENABLE
-Enable the guarded storage facility for the current task.
+Enable the guarded storage facility for the calling task.
 The initial content of the guarded storage control block will be all zeros.
-After the enablement, user space code can use the "Load Guarded Storage
+After enablement, user-space code can use the "Load Guarded Storage
 Controls" (LGSC) instruction (or the
 .BR load_gs_cb ()
 function wrapper provided in the
 .I asm/guarded_storage.h
 header) to load an arbitrary control block.
-While a task is enabled, the kernel will save and restore the current content
+While a task is enabled, the kernel will save and restore the calling content
 of the guarded storage registers on context switch.
 .TP
 .B GS_DISABLE
-Disables the use of the guarded storage facility for the current task.
+Disables the use of the guarded storage facility for the calling task.
 The kernel will cease to save and restore the content of the guarded storage
 registers, the task-specific content of these registers is lost.
 .TP
@@ -52,7 +52,7 @@ Set a broadcast guarded storage control block to the one provided in the
 .I gs_cb
 argument.
 This is called per thread and associates a specific guarded storage control
-block with the current task.
+block with the calling task.
 This control block will be used in the broadcast command
 .BR GS_BROADCAST .
 .TP
@@ -64,10 +64,10 @@ established by the
 command.
 .TP
 .B GS_BROADCAST
-Sends a broadcast to all thread siblings of the current task.
+Sends a broadcast to all thread siblings of the calling task.
 Every sibling that has established a broadcast guarded storage control block
 will load this control block and will be enabled for guarded storage.
-The broadcast guarded storage control block is used up, a second broadcast
+The broadcast guarded storage control block is consumed; a second broadcast
 without a refresh of the stored control block with
 .B GS_SET_BC_CB
 will not have any effect.
@@ -99,7 +99,7 @@ argument has failed.
 .B EINVAL
 The value provided in the
 .I command
-argument was not a valid command.
+argument was not valid.
 .TP
 .B ENOMEM
 .I command
@@ -108,7 +108,7 @@ was one of
 and the allocation of a new guarded storage control block has failed.
 .TP
 .B EOPNOTSUPP
-The guarded storage is not supported by the hardware.
+The guarded storage facility is not supported by the hardware.
 .SH VERSIONS
 .\" 916cda1aa1b412d7cf2991c3af7479544942d121, v4.12-rc1~139^2~56^2
 This system call is available since Linux 4.12.
@@ -130,7 +130,7 @@ The
 .I gs_cb
 structure has a field
 .I gsepla
-(Guarded Storage Event Parameter List Address), which is a user space pointer
+(Guarded Storage Event Parameter List Address), which is a user-space pointer
 to a Guarded Storage Event Parameter List structure (that contains the address
 of the aforementioned event handler in the
 .I gseha