[Feature][ZXW-88]merge P50 version

Only Configure: No
Affected branch: master
Affected module: unknown
Is it affected on both ZXIC and MTK: only ZXIC
Self-test: Yes
Doc Update: No

Change-Id: I34667719d9e0e7e29e8e4368848601cde0a48408
diff --git a/ap/lib/libcurl/curl-7.86.0/docs/cmdline-opts/keepalive-time.d b/ap/lib/libcurl/curl-7.86.0/docs/cmdline-opts/keepalive-time.d
new file mode 100755
index 0000000..9667633
--- /dev/null
+++ b/ap/lib/libcurl/curl-7.86.0/docs/cmdline-opts/keepalive-time.d
@@ -0,0 +1,21 @@
+c: Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Long: keepalive-time
+Arg: <seconds>
+Help: Interval time for keepalive probes
+Added: 7.18.0
+Category: connection
+Example: --keepalive-time 20 $URL
+See-also: no-keepalive max-time
+Multi: single
+---
+This option sets the time a connection needs to remain idle before sending
+keepalive probes and the time between individual keepalive probes. It is
+currently effective on operating systems offering the TCP_KEEPIDLE and
+TCP_KEEPINTVL socket options (meaning Linux, recent AIX, HP-UX and more).
+Keepalives are used by the TCP stack to detect broken networks on idle
+connections. The number of missed keepalive probes before declaring the
+connection down is OS dependent and is commonly 9 or 10. This option has no
+effect if --no-keepalive is used.
+
+If unspecified, the option defaults to 60 seconds.