Fix typos found by Misspell

Misspell Finds commonly misspelled English words
gocryptfs/internal/configfile/scrypt.go
Line 41: warning: "paramter" is a misspelling of "parameter" (misspell)
gocryptfs/internal/ctlsock/ctlsock_serve.go
Line 1: warning: "implementes" is a misspelling of "implements" (misspell)
gocryptfs/tests/test_helpers/helpers.go
Line 27: warning: "compatability" is a misspelling of "compatibility" (misspell)

internal/configfile/scrypt.go

@@ -38,7 +38,7 @@ type ScryptKDF struct {
 	N int
 	// R: scrypt block size parameter
 	R int
-	// P: scrypt parallization paramter
+	// P: scrypt parallelization parameter
 	P int
 	// KeyLen is the output data length
 	KeyLen int

internal/ctlsock/ctlsock_serve.go

@@ -1,4 +1,4 @@
-// Package ctlsock implementes the control socket interface that can be
+// Package ctlsock implements the control socket interface that can be
 // activated by passing "-ctlsock" on the command line.
 package ctlsock
 

internal/exitcodes/exitcodes.go

@@ -16,7 +16,7 @@ const (
 	// ported over here.
 )
 
-// Err wraps and error with an associated numeric exit code
+// Err wraps an error with an associated numeric exit code
 type Err struct {
 	error
 	code int

tests/test_helpers/helpers.go

@@ -24,7 +24,7 @@ const testParentDir = "/tmp/gocryptfs-test-parent"
 // GocryptfsBinary is the assumed path to the gocryptfs build.
 const GocryptfsBinary = "../../gocryptfs"
 
-// UnmountScript is the fusermount/umount compatability wrapper script
+// UnmountScript is the fusermount/umount compatibility wrapper script
 const UnmountScript = "../fuse-unmount.bash"
 
 // TmpDir is a unique temporary directory. "go test" runs package tests in parallel. We create a