[codespell] Fix typos. (#303)

Author: mdosch

README.md

@@ -30,7 +30,7 @@
 ## Features
 - fast and precise MIME type and file extension detection
 - long list of [supported MIME types](supported_mimes.md)
-- posibility to [extend](https://pkg.go.dev/github.com/gabriel-vasile/mimetype#example-package-Extend) with other file formats
+- possibility to [extend](https://pkg.go.dev/github.com/gabriel-vasile/mimetype#example-package-Extend) with other file formats
 - common file formats are prioritized
 - [text vs. binary files differentiation](https://pkg.go.dev/github.com/gabriel-vasile/mimetype#example-package-TextVsBinary)
 - safe for concurrent usage

mime.go

@@ -139,7 +139,7 @@ func (m *MIME) clone(ps map[string]string) *MIME {
 }
 
 // cloneHierarchy creates a clone of m and all its ancestors. The optional MIME
-// parametes are set on the last child of the hierarchy.
+// parameters are set on the last child of the hierarchy.
 func (m *MIME) cloneHierarchy(ps map[string]string) *MIME {
 	ret := m.clone(ps)
 	lastChild := ret

tree.go

@@ -34,7 +34,7 @@ var root = newMIME("application/octet-stream", "",
 // errMIME is same as root but it does not require locking.
 var errMIME = newMIME("application/octet-stream", "", func([]byte, uint32) bool { return false })
 
-// mu guards access to the root MIME tree. Access to root must be synchonized with this lock.
+// mu guards access to the root MIME tree. Access to root must be synchronized with this lock.
 var mu = &sync.RWMutex{}
 
 // The list of nodes appended to the root node.