intro.1, execve.2, getcontext.3, passwd.5, bpf-helpers.7: wfix

Use gender-neutral pronouns.

Signed-off-by: Jakub Wilk <jwilk@jwilk.net>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man1/intro.1

@@ -61,7 +61,7 @@ One types commands to the
 the command interpreter.
 It is not built-in, but is just a program
 and you can change your shell.
-Everybody has her own favorite one.
+Everybody has their own favorite one.
 The standard one is called
 .IR sh .
 See also

man2/execve.2

@@ -559,7 +559,7 @@ The result of mounting a filesystem
 varies across Linux kernel versions:
 some will refuse execution of set-user-ID and set-group-ID
 executables when this would
-give the user powers she did not have already (and return
+give the user powers they did not have already (and return
 .BR EPERM ),
 some will just ignore the set-user-ID and set-group-ID bits and
 .BR exec ()

man3/getcontext.3

@@ -184,7 +184,7 @@ there is no easy way to detect whether a return from
 is from the first call, or via a
 .BR setcontext ()
 call.
-The user has to invent her own bookkeeping device, and a register
+The user has to invent their own bookkeeping device, and a register
 variable won't do since registers are restored.
 .PP
 When a signal occurs, the current user context is saved and

man5/passwd.5

@@ -67,7 +67,7 @@ the shadow record should be obtained from an NIS+ server.
 .PP
 Regardless of whether shadow passwords are used, many system administrators
 use an asterisk (*) in the encrypted password field to make sure
-that this user can not authenticate him- or herself using a
+that this user can not authenticate themself using a
 password.
 (But see NOTES below.)
 .PP

man7/bpf-helpers.7

@@ -2250,7 +2250,7 @@ Depending on the BPF program type, a local storage area
 can be shared between multiple instances of the BPF program,
 running simultaneously.
 .sp
-A user should care about the synchronization by himself.
+A user should care about the synchronization by themself.
 For example, by using the \fBBPF_STX_XADD\fP instruction to alter
 the shared data.
 .TP