docs: spelling and grammar fixes

cmd/add-doc.txt

@@ -1,11 +1,11 @@
 This command will try to build the following structure in repository:
 ├───.git
 │   └───hooks
-│       └───pre-commit // this executable will be added. Existed file with
+│       └───pre-commit // this executable will be added. Existing file with
 │                      // same name will be renamed to pre-commit.old
-(lefthook add this dirs if you run command with -d option)
+(lefthook adds these dirs if you run the command with the -d option)
 │
 ├───.lefthook          // directory for project level hooks
-│   └───pre-commit     // directory with hooks executables
-└───.lefthook-local    // directory for personal hooks add it in .gitignore
+│   └───pre-commit     // directory with hook executables
+└───.lefthook-local    // directory for personal hooks; add it in .gitignore
     └───pre-commit

cmd/add.go

@@ -16,7 +16,7 @@ func newAddCmd(opts *lefthook.Options) *cobra.Command {
 
 	addCmd := cobra.Command{
 		Use:     "add hook-name",
-		Short:   "This command add a hook directory to a repository",
+		Short:   "This command adds a hook directory to a repository",
 		Long:    addDoc,
 		Example: "lefthook add pre-commit",
 		Args:    cobra.MinimumNArgs(1),

docs/configuration.md

@@ -225,7 +225,7 @@ Use cases:
 
 - You have a GUI program that runs git hooks (e.g., VSCode)
 - You reference executables that are accessible only from a tweaked $PATH environment variable (e.g., when using rbenv or nvm)
-- Or even if your GUI programm cannot locate the `lefthook` executable :scream:
+- Or even if your GUI program cannot locate the `lefthook` executable :scream:
 - Or if you want to use ENV variables that control the executables behavior in `lefthook.yml`
 
 ```bash
@@ -305,7 +305,7 @@ This can be changed in the future. For convenience, please use `remote` configur
 
 ### `git_url`
 
-A URL to Git repository. It will be accessed with priveleges of the machine lefthook runs on.
+A URL to Git repository. It will be accessed with privileges of the machine lefthook runs on.
 
 **Example**
 
@@ -1085,7 +1085,7 @@ Whether to use interactive mode. This applies the certain behavior:
 
 **Note**
 
-If you want to pass stdin to your command or script but don't need to get the input from CLI, use [`use_stdin`](#use_stdin) option isntead.
+If you want to pass stdin to your command or script but don't need to get the input from CLI, use [`use_stdin`](#use_stdin) option instead.
 
 ## Script
 

internal/git/exec.go

@@ -47,7 +47,7 @@ func (o *OsExec) CmdLines(cmd string) ([]string, error) {
 	return strings.Split(out, "\n"), nil
 }
 
-// CmdArgs runs a command provided with separted words. Trims spaces around output.
+// CmdArgs runs a command provided with separated words. Trims spaces around output.
 func (o *OsExec) CmdArgs(args ...string) (string, error) {
 	out, err := o.rawExecArgs(args...)
 	if err != nil {

internal/lefthook/run.go

@@ -65,8 +65,8 @@ func (l *Lefthook) Run(hookName string, args RunArgs, gitArgs []string) error {
 		return err
 	}
 
-	// Suppress prepare-commit-msg output if the hook doesn't exists in config.
-	// prepare-commit-msg hook is used for seemless synchronization of hooks with config.
+	// Suppress prepare-commit-msg output if the hook doesn't exist in config.
+	// prepare-commit-msg hook is used for seamless synchronization of hooks with config.
 	// See: internal/lefthook/install.go
 	_, ok := cfg.Hooks[hookName]
 	if hookName == config.GhostHookName && !ok && !verbose {
@@ -136,7 +136,7 @@ Run 'lefthook install' manually.`,
 	}
 
 	if cfg.Remote.Configured() {
-		// Apend only source_dir, because source_dir_local doesn't make sense
+		// Append only source_dir, because source_dir_local doesn't make sense
 		sourceDirs = append(
 			sourceDirs,
 			filepath.Join(