scripted-diff: Use std::span over Span

-BEGIN VERIFY SCRIPT-

 ren() { sed -i "s!\<$1\>!$2!g" $( git grep -l "$1" -- "./src" ":(exclude)src/span.h" ":(exclude)src/leveldb/db/log_test.cc" ) ; }

 ren Span            std::span
 ren AsBytes         std::as_bytes
 ren AsWritableBytes std::as_writable_bytes

 sed -i 's!SpanPopBack(Span!SpanPopBack(std::span!g' ./src/span.h

-END VERIFY SCRIPT-

src/util/sock.cpp

@@ -242,7 +242,7 @@ bool Sock::WaitMany(std::chrono::milliseconds timeout, EventsPerSock& events_per
 #endif /* USE_POLL */
 }
 
-void Sock::SendComplete(Span<const unsigned char> data,
+void Sock::SendComplete(std::span<const unsigned char> data,
                         std::chrono::milliseconds timeout,
                         CThreadInterrupt& interrupt) const
 {
@@ -283,7 +283,7 @@ void Sock::SendComplete(Span<const unsigned char> data,
     }
 }
 
-void Sock::SendComplete(Span<const char> data,
+void Sock::SendComplete(std::span<const char> data,
                         std::chrono::milliseconds timeout,
                         CThreadInterrupt& interrupt) const
 {