all: fix spelling across the project

* abcdefghijklmnopqrstuvwxyz
* accounting
* additional
* allowed
* almost
* already
* appropriately
* arise
* bandwidth
* behave
* bidirectional
* brackets
* cached
* characters
* cloud
* committing
* concatenating
* configured
* constructs
* current
* cutoff
* deferred
* different
* directory
* disposition
* dropbox
* either way
* error
* excess
* experiments
* explicitly
* externally
* files
* github
* gzipped
* hierarchies
* huffman
* hyphen
* implicitly
* independent
* insensitive
* integrity
* libraries
* literally
* metadata
* mimics
* missing
* modification
* multipart
* multiple
* nightmare
* nonexistent
* number
* obscure
* ourselves
* overridden
* potatoes
* preexisting
* priority
* received
* remote
* replacement
* represents
* reproducibility
* response
* satisfies
* sensitive
* separately
* separator
* specifying
* string
* successful
* synchronization
* syncing
* šenfeld
* take
* temporarily
* testcontents
* that
* the
* themselves
* throttling
* timeout
* transaction
* transferred
* unnecessary
* using
* webbrowser
* which
* with
* workspace

Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com>

backend/mega/mega.go

@@ -347,7 +347,7 @@ func (f *Fs) mkdir(ctx context.Context, rootNode *mega.Node, dir string) (node *
 		}
 	}
 	if err != nil {
-		return nil, fmt.Errorf("internal error: mkdir called with non-existent root node: %w", err)
+		return nil, fmt.Errorf("internal error: mkdir called with nonexistent root node: %w", err)
 	}
 	// i is number of directories to create (may be 0)
 	// node is directory to create them from
@@ -387,7 +387,7 @@ func (f *Fs) findRoot(ctx context.Context, create bool) (*mega.Node, error) {
 		return f._rootNode, nil
 	}
 
-	// Check for pre-existing root
+	// Check for preexisting root
 	absRoot := f.srv.FS.GetRoot()
 	node, err := f.findDir(absRoot, f.root)
 	//log.Printf("findRoot findDir %p %v", node, err)