doc: add doc links on Deprecated notices

Add doc links in deprecation notices mentionned in Go doc comments.

About doc links: https://go.dev/doc/comment#doclinks

channel.go

@@ -214,7 +214,7 @@ func Buffer[T any](ch <-chan T, size int) (collection []T, length int, readTime
 
 // Buffer creates a slice of n elements from a channel. Returns the slice and the slice length.
 //
-// Deprecated: Use lo.Buffer instead.
+// Deprecated: Use [Buffer] instead.
 func Batch[T any](ch <-chan T, size int) (collection []T, length int, readTime time.Duration, ok bool) {
 	return Buffer(ch, size)
 }
@@ -248,7 +248,7 @@ func BufferWithTimeout[T any](ch <-chan T, size int, timeout time.Duration) (col
 
 // BufferWithTimeout creates a slice of n elements from a channel, with timeout. Returns the slice and the slice length.
 //
-// Deprecated: Use lo.BufferWithTimeout instead.
+// Deprecated: Use [BufferWithTimeout] instead.
 func BatchWithTimeout[T any](ch <-chan T, size int, timeout time.Duration) (collection []T, length int, readTime time.Duration, ok bool) {
 	return BufferWithTimeout(ch, size, timeout)
 }
@@ -281,7 +281,7 @@ func FanIn[T any](channelBufferCap int, upstreams ...<-chan T) <-chan T {
 // ChannelMerge collects messages from multiple input channels into a single buffered channel.
 // Output messages has no priority. When all upstream channels reach EOF, downstream channel closes.
 //
-// Deprecated: Use lo.FanIn instead.
+// Deprecated: Use [FanIn] instead.
 func ChannelMerge[T any](channelBufferCap int, upstreams ...<-chan T) <-chan T {
 	return FanIn(channelBufferCap, upstreams...)
 }