vim-patch:8.0.1809: various typos

Problem:    Various typos.
Solution:   Correct the mistakes, change "cursur" to "cursor". (closes vim/vim#2887)
b946482190

src/nvim/edit.c

@@ -298,7 +298,7 @@ static void insert_enter(InsertState *s)
 
   // Check if the cursor line needs redrawing before changing State. If
   // 'concealcursor' is "n" it needs to be redrawn without concealing.
-  conceal_check_cursur_line();
+  conceal_check_cursor_line();
 
   // When doing a paste with the middle mouse button, Insstart is set to
   // where the paste started.

src/nvim/normal.c

@@ -6497,7 +6497,7 @@ void may_start_select(int c)
 static void n_start_visual_mode(int c)
 {
   /* Check for redraw before changing the state. */
-  conceal_check_cursur_line();
+  conceal_check_cursor_line();
 
   VIsual_mode = c;
   VIsual_active = true;
@@ -6515,7 +6515,7 @@ static void n_start_visual_mode(int c)
 
   setmouse();
   /* Check for redraw after changing the state. */
-  conceal_check_cursur_line();
+  conceal_check_cursor_line();
 
   if (p_smd && msg_silent == 0)
     redraw_cmdline = true;      /* show visual mode later */

src/nvim/screen.c

@@ -478,7 +478,7 @@ int conceal_cursor_line(win_T *wp)
 /*
  * Check if the cursor line needs to be redrawn because of 'concealcursor'.
  */
-void conceal_check_cursur_line(void)
+void conceal_check_cursor_line(void)
 {
   if (curwin->w_p_cole > 0 && conceal_cursor_line(curwin)) {
     need_cursor_line_redraw = TRUE;

src/nvim/ui.c

@@ -393,7 +393,7 @@ void ui_cursor_shape(void)
     mode_idx = new_mode_idx;
     pending_mode_update = true;
   }
-  conceal_check_cursur_line();
+  conceal_check_cursor_line();
 }
 
 /// Returns true if `widget` is externalized.