FPGA: Update the include folder readme (oneapi-src#861)

* reorganize header names and remove utils.hpp

Signed-off-by: Yohann Uguen <[email protected]>

* Changing table titles size

Signed-off-by: Yohann Uguen <[email protected]>

* rephrasing descriptions

Signed-off-by: Yohann Uguen <[email protected]>

Author: yuguen

DirectProgramming/DPC++FPGA/include/README.md

@@ -2,15 +2,22 @@
 This directory contains utility header libraries optimized for FPGA DPC++ designs. Examples of their usage can be found in ReferenceDesigns and Tutorials.
 
 ## Available Header Libraries
+
+### Utilities
+
 | Filename       | Description
 ---              |---
-| pipe_utils.hpp | Defines utilities for working with pipes, such as PipeArray.
 | constexpr_math.hpp | Defines utilities for statically computing math functions such as Log2.
+| pipe_utils.hpp | Utility classes for working with pipes, such as PipeArray.
 | tuple.hpp | Defines a template to implement tuples.
 | unrolled_loop.hpp | Defines a templated implementation of unrolled loops.
-| streaming_qrd.hpp | Defines a functor that implements the QR decomposition of matrices.
-| streaming_qri.hpp | Defines a functor that implements the QR-based inversion of matrices.
-| utils.hpp | Defines commonly used classes.
+
+### Linear algebra
+
+| Filename       | Description
+---              |---
+| streaming_qrd.hpp | QR decomposition of matrices with pipe interfaces.
+| streaming_qri.hpp | QR-based inversion of matrices with pipe interfaces.
 
 ## License  
 Code samples are licensed under the MIT license. See