[GH-19267] Spelling comments (#19268)

* spelling: comments

Signed-off-by: Josh Soref <jsoref@users.noreply.github.com>
Co-authored-by: Josh Soref <jsoref@users.noreply.github.com>
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/user.go

@@ -2037,7 +2037,7 @@ func (a *App) GetViewUsersRestrictions(userID string) (*model.ViewUsersRestricti
 	return &model.ViewUsersRestrictions{Teams: teamIDsWithPermission, Channels: channelIDs}, nil
 }
 
-// PromoteGuestToUser Convert user's roles and all his mermbership's roles from
+// PromoteGuestToUser Convert user's roles and all his membership's roles from
 // guest roles to regular user roles.
 func (a *App) PromoteGuestToUser(c *request.Context, user *model.User, requestorId string) *model.AppError {
 	nErr := a.ch.srv.userService.PromoteGuestToUser(user)
@@ -2097,7 +2097,7 @@ func (a *App) PromoteGuestToUser(c *request.Context, user *model.User, requestor
 	return nil
 }
 
-// DemoteUserToGuest Convert user's roles and all his mermbership's roles from
+// DemoteUserToGuest Convert user's roles and all his membership's roles from
 // regular user roles to guest roles.
 func (a *App) DemoteUserToGuest(user *model.User) *model.AppError {
 	demotedUser, nErr := a.ch.srv.userService.DemoteUserToGuest(user)