chore(docs): remove naming inconsistencies

[zhpenkov]

related to: https://github.com/telerik/kendo-themes-private/issues/195

Summary:
Title across our .md file docs is generated by capitalizing the value of a group.

Example:
When the group value is:

/// @group floating-label

The component title will be:

# Customizing Floating-label

Some component's generated title is inconsistent with the proper naming of the component ( FloatingLabel ).

Solution:
We use a hyphen for separating individual words from the compound words for the group values ( example above ).
We can utilize the hyphen to create a title based on each capitalized individual word that makes up the compound word.
( kebab case to pascal case )

List of variable groups that have been updated as well:

• coloreditor -> color-editor
• colorgradient -> color-gradient
• colorpalette -> color-palette
• filemanager -> file-manager
• tilelayout -> tile-layout

[Juveniel]

lgtm; change commit to docs: ...