Give time.h a title and move to low-level infra group

Change-Id: I4cb50bda726fcc0f22fcb53dca92cf297aeea169
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/64929
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Bob Beck <bbe@google.com>

include/openssl/time.h

diff --git a/include/openssl/time.h b/include/openssl/time.h
index 723ce10..50db22d 100644
--- a/include/openssl/time.h
+++ b/include/openssl/time.h
@@ -23,6 +23,10 @@
 extern "C" {
 #endif
 
+
+// Time functions.
+
+
 // OPENSSL_posix_to_tm converts a int64_t POSIX time value in |time|, which must
 // be in the range of year 0000 to 9999, to a broken out time value in |tm|. It
 // returns one on success and zero on error.

util/doc.config

diff --git a/util/doc.config b/util/doc.config
index 49b0ec6..29bba67 100644
--- a/util/doc.config
+++ b/util/doc.config
@@ -15,7 +15,8 @@
       "include/openssl/obj.h",
       "include/openssl/pool.h",
       "include/openssl/rand.h",
-      "include/openssl/stack.h"
+      "include/openssl/stack.h",
+      "include/openssl/time.h"
     ]
   },{
     "Name": "Low-level crypto primitives",
@@ -56,8 +57,7 @@
     "Name": "Legacy ASN.1 and X.509 implementation (documentation in progress)",
     "Headers": [
       "include/openssl/asn1.h",
-      "include/openssl/conf.h",
-      "include/openssl/time.h"
+      "include/openssl/conf.h"
     ]
   },{
     "Name": "SSL implementation",