all: fix some comment issues

Change-Id: I5dec35b1432705b3a52859c38e758220282226af
Reviewed-on: https://go-review.googlesource.com/c/go/+/726700
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Sean Liao <sean@liao.dev>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>

src/crypto/md5/gen.go

@@ -153,7 +153,7 @@ var data = Data{
 		0x8d2a4c8a,
 	},
 	Table3: []uint32{
-		// round3
+		// round 3
 		0xfffa3942,
 		0x8771f681,
 		0x6d9d6122,

src/crypto/tls/ticket.go

@@ -81,7 +81,7 @@ type SessionState struct {
 	version     uint16
 	isClient    bool
 	cipherSuite uint16
-	// createdAt is the generation time of the secret on the sever (which for
+	// createdAt is the generation time of the secret on the server (which for
 	// TLS 1.0–1.2 might be earlier than the current session) and the time at
 	// which the ticket was received on the client.
 	createdAt        uint64 // seconds since UNIX epoch

src/encoding/gob/decgen.go

@@ -4,8 +4,8 @@
 
 //go:build ignore
 
-// encgen writes the helper functions for encoding. Intended to be
-// used with go generate; see the invocation in encode.go.
+// decgen writes the helper functions for decoding. Intended to be
+// used with go generate; see the invocation in decode.go.
 
 // TODO: We could do more by being unsafe. Add a -unsafe flag?
 

src/go/ast/walk.go

@@ -370,7 +370,7 @@ func (f inspector) Visit(node Node) Visitor {
 // call of f(nil).
 //
 // In many cases it may be more convenient to use [Preorder], which
-// returns an iterator over the sqeuence of nodes, or [PreorderStack],
+// returns an iterator over the sequence of nodes, or [PreorderStack],
 // which (like [Inspect]) provides control over descent into subtrees,
 // but additionally reports the stack of enclosing nodes.
 func Inspect(node Node, f func(Node) bool) {

src/net/http/cookie.go

@@ -443,7 +443,8 @@ func isCookieDomainName(s string) bool {
 	}
 
 	if s[0] == '.' {
-		// A cookie a domain attribute may start with a leading dot.
+		// A cookie domain attribute may start with a leading dot.
+		// Per RFC 6265 section 5.2.3, a leading dot is ignored.
 		s = s[1:]
 	}
 	last := byte('.')

src/runtime/mgc.go

@@ -5,7 +5,7 @@
 // Garbage collector (GC).
 //
 // The GC runs concurrently with mutator threads, is type accurate (aka precise), allows multiple
-// GC thread to run in parallel. It is a concurrent mark and sweep that uses a write barrier. It is
+// GC threads to run in parallel. It is a concurrent mark and sweep that uses a write barrier. It is
 // non-generational and non-compacting. Allocation is done using size segregated per P allocation
 // areas to minimize fragmentation while eliminating locks in the common case.
 //