compress: add a new module compress.gzip too (#14686)

vlib/compress/deflate/README.md

@@ -3,9 +3,6 @@
 `compress.deflate` is a module that assists in the compression and
 decompression of binary data using `deflate` compression
 
-NOTE: To decompress gzip, discard first 10 bytes of compressed bytes
-then use `compress.deflate.decompress`. (Header validation won't be
-performed in this case)
 
 ## Examples:
 

vlib/compress/deflate/deflate.v

@@ -2,15 +2,14 @@ module deflate
 
 import compress
 
-// compresses an array of bytes using gzip and returns the compressed bytes in a new array
-// Example: compressed := gzip.compress(b)?
+// compresses an array of bytes using deflate and returns the compressed bytes in a new array
+// Example: compressed := deflate.compress(b)?
 pub fn compress(data []u8) ?[]u8 {
 	return compress.compress(data, 0)
 }
 
-// decompresses an array of bytes using zlib and returns the decompressed bytes in a new array
-// Example: decompressed := zlib.decompress(b)?
-[manualfree]
+// decompresses an array of bytes using deflate and returns the decompressed bytes in a new array
+// Example: decompressed := deflate.decompress(b)?
 pub fn decompress(data []u8) ?[]u8 {
 	return compress.decompress(data, 0)
 }