drive: fix minor typos in comments

Signed-off-by: Craig Hesling <craig@hesling.com>

drive/driveimpl/dirfs/dirfs.go

@@ -44,7 +44,7 @@ func (c *Child) isAvailable() bool {
 // Any attempts to perform operations on paths inside of children will result
 // in a panic, as these are not expected to be performed on this FS.
 //
-// An FS an optionally have a StaticRoot, which will insert a folder with that
+// An FS can optionally have a StaticRoot, which will insert a folder with that
 // StaticRoot into the tree, like this:
 //
 // -- <StaticRoot>

drive/driveimpl/fileserver.go

@@ -61,7 +61,7 @@ func NewFileServer() (*FileServer, error) {
 	}, nil
 }
 
-// generateSecretToken generates a hex-encoded 256 bit secet.
+// generateSecretToken generates a hex-encoded 256 bit secret.
 func generateSecretToken() (string, error) {
 	tokenBytes := make([]byte, 32)
 	_, err := rand.Read(tokenBytes)

drive/remote_permissions.go

@@ -32,7 +32,7 @@ type grant struct {
 	Access string
 }
 
-// ParsePermissions builds a Permissions map from a lis of raw grants.
+// ParsePermissions builds a Permissions map from a list of raw grants.
 func ParsePermissions(rawGrants [][]byte) (Permissions, error) {
 	permissions := make(Permissions)
 	for _, rawGrant := range rawGrants {