examples: add most docstrings

examples/sha1/asm.go

@@ -10,6 +10,7 @@ import (
 
 func main() {
 	TEXT("block", "func(h *[5]uint32, m []byte)")
+	Doc("block SHA-1 hashes the 64-byte message m into the running state h.")
 	h := Mem{Base: Load(Param("h"), GP64v())}
 	m := Mem{Base: Load(Param("m").Base(), GP64v())}
 

examples/sha1/stub.go

@@ -2,4 +2,5 @@
 
 package sha1
 
+// block SHA-1 hashes the 64-byte message m into the running state h.
 func block(h *[5]uint32, m []byte)