all: replace "NB:" with "Note:" (docs/comments)

examples/news_fetcher.v

@@ -40,7 +40,7 @@ fn main() {
 	mut fetcher_pool := pool.new_pool_processor(
 		callback: worker_fetch
 	)
-	// NB: if you do not call set_max_jobs, the pool will try to use an optimal
+	// Note: if you do not call set_max_jobs, the pool will try to use an optimal
 	// number of threads, one per each core in your system, which in most
 	// cases is what you want anyway... You can override the automatic choice
 	// by setting the VJOBS environment variable too.

examples/sokol/sounds/wav_player.v

@@ -88,7 +88,7 @@ fn (mut p Player) free() {
 // http://www.lightlink.com/tjweber/StripWav/WAVE.html
 // http://www.lightlink.com/tjweber/StripWav/Canon.html
 // https://tools.ietf.org/html/draft-ema-vpim-wav-00
-// NB: > The chunks MAY appear in any order except that the Format chunk
+// Note: > The chunks MAY appear in any order except that the Format chunk
 // > MUST be placed before the Sound data chunk (but not necessarily
 // > contiguous to the Sound data chunk).
 struct RIFFHeader {

examples/tree_of_nodes.v

@@ -8,7 +8,7 @@ struct Node {
 	right Tree
 }
 
-// NB: a match expression, infers the type of its result
+// Note: a match expression, infers the type of its result
 // from the type of the return value in the first branch,
 // => it needs an explicit int(0) cast here:
 fn size(tree Tree) int {

examples/vweb/server_sent_events/server.v

@@ -24,7 +24,7 @@ pub fn (mut app App) index() vweb.Result {
 
 fn (mut app App) sse() vweb.Result {
 	mut session := sse.new_connection(app.conn)
-	// NB: you can setup session.write_timeout and session.headers here
+	// Note: you can setup session.write_timeout and session.headers here
 	session.start() or { return app.server_error(501) }
 	session.send_message(data: 'ok') or { return app.server_error(501) }
 	for {