fix(skills): removed misleading listing of bar as category chart type

[ivanvpetrov]

Description

The IgxCategoryChartComponent sections in the charts.md skills incorrectly listed "Bar" among the supported chart types.
This leads to falsely generating category charts like this:

<igx-category-chart chartType="Bar"
    ...
</igx-category-chart>

Changes

• Updated the Related note under Column Chart to clarify that the horizontal bar equivalent requires switching to IgxDataChartComponent with IgxBarSeriesComponent
• Removed "Bar" from the IgxCategoryChartComponent API section header; replaced with accurate types: Area, Column, Line, Point, Spline, Step, Waterfall

[Copilot]

Pull request overview

Updates the charts skills reference to stop implying that IgxCategoryChartComponent supports “Bar” charts, and clarifies that horizontal bar charts require using IgxDataChartComponent with IgxBarSeriesComponent.

Changes:

• Updated the main “Category Chart” description/usage guidance to remove “Bar” and list supported category chart types.
• Clarified the Column Chart “Related” note to direct users to IgxDataChartComponent + IgxBarSeriesComponent for horizontal bars.
• Updated the Category Chart API and data requirements headings to remove “Bar”.

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 3 comments.