test: Fixup docs for NodeClockContext and SteadyClockContext

diff --git a/src/test/fuzz/util/check_globals.cpp b/src/test/fuzz/util/check_globals.cpp
index f91a965a..ca311153 100644
--- a/src/test/fuzz/util/check_globals.cpp
+++ b/src/test/fuzz/util/check_globals.cpp
@@ -42,8 +42,10 @@ struct CheckGlobalsImpl {
             std::cerr << "\n\n"
                          "The current fuzz target accessed system time.\n\n"
 
-                         "This is acceptable, but requires the fuzz target to call \n"
-                         "SetMockTime() at the beginning of processing the fuzz input.\n\n"
+                         "This is acceptable, but requires the fuzz target to use \n"
+                         "a NodeClockContext, SteadyClockContext or call \n"
+                         "SetMockTime() at the \n" "beginning of processing the \n"
+                         "fuzz input.\n\n"
 
                          "Without setting mock time, time-dependent behavior can lead \n"
                          "to non-reproducible bugs or inefficient fuzzing.\n\n"
diff --git a/src/util/time.h b/src/util/time.h
index 59abc4d5..967ea780 100644
--- a/src/util/time.h
+++ b/src/util/time.h
@@ -14,7 +14,8 @@
 
 using namespace std::chrono_literals;
 
-/** Mockable clock in the context of tests, otherwise the system clock */
+/// Version of the system clock that is mockable in the context of tests (via
+/// NodeClockContext or ::SetMockTime), otherwise the system clock.
 struct NodeClock : public std::chrono::system_clock {
     using time_point = std::chrono::time_point<NodeClock>;
     /** Return current system time or mocked time, if set */
@@ -31,10 +32,9 @@ using SteadyMicroseconds = std::chrono::time_point<std::chrono::steady_clock, st
 
 using SystemClock = std::chrono::system_clock;
 
-/**
- * Version of SteadyClock that is mockable in the context of tests (set the
- * current value with SetMockTime), otherwise the system steady clock.
- */
+/// Version of SteadyClock that is mockable in the context of tests (via
+/// SteadyClockContext, or Self::SetMockTime), otherwise the system steady
+/// clock.
 struct MockableSteadyClock : public std::chrono::steady_clock {
     using time_point = std::chrono::time_point<MockableSteadyClock>;