Update bootstrap v4 string

site/docs/api/table-options.md

@@ -89,7 +89,7 @@ The table options are defined in `jQuery.fn.bootstrapTable.defaults`.
 
 - **Detail:**
 
-  The class name of table thead. Bootstrap V4, use the modifier classes `.thead-light` or `.thead-dark` to make `thead`s appear light or dark gray.
+  The class name of table thead. Bootstrap v4, use the modifier classes `.thead-light` or `.thead-dark` to make `thead`s appear light or dark gray.
 
 - **Default:** `''`
 
@@ -1141,6 +1141,6 @@ The table options are defined in `jQuery.fn.bootstrapTable.defaults`.
 
 - **Detail:**
 
-  Defines icon set name (`'glyphicon'` or `'fa'` for FontAwesome). By default `'fa'` is used for Bootstrap V4.
+  Defines icon set name (`'glyphicon'` or `'fa'` for FontAwesome). By default `'fa'` is used for Bootstrap v4.
 
 - **Default:** `'fa'`

site/docs/getting-started/introduction.md

@@ -33,7 +33,7 @@ Place the following `<script>`s near the end of your pages, right before the clo
 
 Be sure to have your pages set up with the latest design and development standards. That means using an HTML5 doctype and including a viewport meta tag for proper responsive behaviors.
 
-For Bootstrap V4, we use [Font Awesome](https://fontawesome.com/icons) as the default icons, so need to import Font Awesome link.
+For Bootstrap v4, we use [Font Awesome](https://fontawesome.com/icons) as the default icons, so need to import Font Awesome link.
 
 Put it all together and your pages should look like this: