docs: fix typos (#22353)

src/nvim/api/extmark.c

@@ -445,7 +445,7 @@ Array nvim_buf_get_extmarks(Buffer buffer, Integer ns_id, Object start, Object e
 ///                   buffer.
 ///               - right_gravity : boolean that indicates the direction
 ///                   the extmark will be shifted in when new text is inserted
-///                   (true for right, false for left).  defaults to true.
+///                   (true for right, false for left). Defaults to true.
 ///               - end_right_gravity : boolean that indicates the direction
 ///                   the extmark end position (if it exists) will be shifted
 ///                   in when new text is inserted (true for right, false

src/nvim/api/ui.c

@@ -382,7 +382,7 @@ static void ui_set_option(UI *ui, bool init, String name, Object value, Error *e
       });
       bool boolval = value.data.boolean;
       if (!init && i == kUILinegrid && boolval != ui->ui_ext[i]) {
-        // There shouldn't be a reason for an UI to do this ever
+        // There shouldn't be a reason for a UI to do this ever
         // so explicitly don't support this.
         api_set_error(err, kErrorTypeValidation, "ext_linegrid option cannot be changed");
       }