Update docs/eta-pi-p/index.md

2nd intro. sentence Co-authored-by: Remco de Boer <[email protected]>
ComPWA · Aug 21, 2024 · 3a43450 · 3a43450
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 This document is a follow-up of PWA101 (v1.0), see **[TR&#8209;033](https://compwa.github.io/report/033)**.
 
-Now the focus is the use of symbolic expressions (computations), with the use of [ComPWA packages](https://compwa.github.io/), or CAS(Computer Algebra System)-assisted model building in general (the python package SymPy in this case) to illustrate the general process in PWA.
+The tutorial has been split into separate notebooks and the amplitude model is instead formulated using CAS-assisted (Computer Algebra System) model building using SymPy and the [ComPWA packages](https://compwa.github.io/).
 Address to the issue ✅&nbsp;[ComPWA/gluex-nstar#1](https://github.com/ComPWA/gluex-nstar/issues/1), this document is PWA101(v2.0), which shows PWA methodologies and full workflow in the context of hadron physics with symbolic expressions via `sympy` and [ComPWA](https://compwa.github.io/).
 
 In the following, an attempt to manually formulate the amplitude model via Sympy is shown.