ThemeBuilder: remove mentions of Bootstrap < 5 (DevExpress#6979) (DevExpress#6981)

Author: vladaskorohodova

concepts/60 Themes and Styles/08 ThemeBuilder/01 Get Started/7 Import an Existing Theme.md

@@ -6,9 +6,9 @@ You can import an existing theme from DevExtreme metadata [saved beforehand](/co
 
 3. To import DevExtreme metadata, upload a `.json` file with the metadata or paste the metadata in the text area.  
 
-    To import Bootstrap variables, upload a `variables.less` for Bootstrap 3 or `_variables.scss` file for Bootstrap 4.
+    To import Bootstrap variables, upload a `_variables.scss` file for Bootstrap 5.
 
-    [note] These files should include only a list of variables and their values. 
+    [note] This file should include only a list of variables and their values. 
 
     The ThemeBuilder uses colors from the variables to create a theme that is consistent with the Bootstrap theme. ThemeBuilder imports theme options based on the Bootstrap [default theme](https://github.com/twbs/bootstrap/blob/main/scss/_variables.scss) variables. These colors are transferred to the base theme settings. You can find these settings in the **Basic Settings** section.
 

concepts/Common/DevExtreme CLI/50 ThemeBuilder/10 Command-Line Arguments.md

@@ -2,7 +2,7 @@
 Specifies a base theme's name (default: `generic.light`).
 
 * `--input-file`    
-Specifies the name of the file that contains input data (a `.json` file with metadata or a `.less` or `.scss` file with Bootstrap variables).
+Specifies the name of the file that contains input data (a `.json` file with metadata or a `.scss` file with Bootstrap 5 variables).
 
 * `--output-file`   
 Specifies the output file name.
@@ -32,6 +32,3 @@ Specifies a path to the folder that contains the DevExtreme `icons` and `fonts`
 
 - `--remove-external-resources`     
 When present, removes links to external resources, such as fonts. The theme will use local fallbacks instead.
-
-- `--bootstrap-version`     
-Specifies Bootstrap version 4 or 5 if `--input-file` is a `.scss` file (default: `4`).