cleanup, docs

site/doc/pages/signal_name.txt

@@ -7,17 +7,16 @@ return value : signal name such as `SIGSEGV`, or an empty string when unknown
 
 :see
 >runtime
-capture_backtrace_string
-backtrace_frames_string
+backtrace_capture
+backtrace_get_frames
 
 :content
 Returns a readable name for a POSIX signal number.
 
 Example:
 
-```uce
-String name = signal_name(11);
-// name == "SIGSEGV"
-```
 
 This is mostly useful in diagnostics and error reporting code.
+
+:example
+print("signal_name example\n");