MINOR: No longer rely on deprecated sample fetches for predefined ACLs

Some predefined ACLs were still based on deprecated sample fetches, like
req_proto_http or req_ver. Now, they use non-deprecated sample fetches. In
addition, the usage lines in the configuration manual have been updated to
be more explicit.

(cherry picked from commit 779184e35e4468d86419fb1935ca3491f1081d0b)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
diff --git a/src/acl.c b/src/acl.c
index 5dc77a0..d8a67f5 100644
--- a/src/acl.c
+++ b/src/acl.c
@@ -759,9 +759,9 @@
 	{ .name = "TRUE",           .expr = {"always_true",""}},
 	{ .name = "FALSE",          .expr = {"always_false",""}},
 	{ .name = "LOCALHOST",      .expr = {"src","127.0.0.1/8",""}},
-	{ .name = "HTTP",           .expr = {"req_proto_http",""}},
-	{ .name = "HTTP_1.0",       .expr = {"req_ver","1.0",""}},
-	{ .name = "HTTP_1.1",       .expr = {"req_ver","1.1",""}},
+	{ .name = "HTTP",           .expr = {"req.proto_http",""}},
+	{ .name = "HTTP_1.0",       .expr = {"req.ver","1.0",""}},
+	{ .name = "HTTP_1.1",       .expr = {"req.ver","1.1",""}},
 	{ .name = "METH_CONNECT",   .expr = {"method","CONNECT",""}},
 	{ .name = "METH_DELETE",    .expr = {"method","DELETE",""}},
 	{ .name = "METH_GET",       .expr = {"method","GET","HEAD",""}},
@@ -773,9 +773,9 @@
 	{ .name = "HTTP_URL_ABS",   .expr = {"url_reg","^[^/:]*://",""}},
 	{ .name = "HTTP_URL_SLASH", .expr = {"url_beg","/",""}},
 	{ .name = "HTTP_URL_STAR",  .expr = {"url","*",""}},
-	{ .name = "HTTP_CONTENT",   .expr = {"hdr_val(content-length)","gt","0",""}},
-	{ .name = "RDP_COOKIE",     .expr = {"req_rdp_cookie_cnt","gt","0",""}},
-	{ .name = "REQ_CONTENT",    .expr = {"req_len","gt","0",""}},
+	{ .name = "HTTP_CONTENT",   .expr = {"req.hdr_val(content-length)","gt","0",""}},
+	{ .name = "RDP_COOKIE",     .expr = {"req.rdp_cookie_cnt","gt","0",""}},
+	{ .name = "REQ_CONTENT",    .expr = {"req.len","gt","0",""}},
 	{ .name = "WAIT_END",       .expr = {"wait_end",""}},
 	{ .name = NULL, .expr = {""}}
 };