git: db1cdf2fabfe - main - libcasper.3: document cap_init's single-threaded program requirement

The branch main has been updated by asomers:

URL: https://cgit.FreeBSD.org/src/commit/?id=db1cdf2fabfe15592ced2dedfb738778f2e2d441

commit db1cdf2fabfe15592ced2dedfb738778f2e2d441
Author:     Alan Somers <asomers@FreeBSD.org>
AuthorDate: 2023-01-11 03:01:59 +0000
Commit:     Alan Somers <asomers@FreeBSD.org>
CommitDate: 2023-01-11 03:53:30 +0000

    libcasper.3: document cap_init's single-threaded program requirement
    
    Because it internally forks.
    
    [skip ci]
    MFC after:      1 week
    Sponsored by:   Axcient
    Reviewed by     emaste, imp
    Differential Revision: https://reviews.freebsd.org/D38020
---
 lib/libcasper/libcasper/libcasper.3 | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/libcasper/libcasper/libcasper.3 b/lib/libcasper/libcasper/libcasper.3
index a53ebed0dff1..6d4c49cf8ad0 100644
--- a/lib/libcasper/libcasper/libcasper.3
+++ b/lib/libcasper/libcasper/libcasper.3
@@ -28,7 +28,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd September 29, 2022
+.Dd January 10, 2023
 .Dt LIBCASPER 3
 .Os
 .Sh NAME
@@ -96,6 +96,7 @@ The
 .Fn cap_init
 function instantiates a capability to allow a program to access
 the casper daemon.
+It must be called from a single-threaded context.
 .Pp
 The
 .Fn cap_wrap