docs: fix grammar and phrasing issues (1, 2, 3)

[CharlesCNorton]

1. Insert missing article "a":

   • Original: "This repo is work in progress..."
   • Revised: "This repo is a work in progress..." Rationale: The article "a" is needed before "work in progress" to make the sentence grammatically correct.

2. Add "as well as" for parallelism:

   • Original: "...scripts to train and evaluate models as well generate synthetic data..."
   • Revised: "...scripts to train and evaluate models as well as generate synthetic data..." Rationale: "As well as" is the correct conjunction to link multiple verbs or verb phrases, improving clarity.

3. Clarify GPU resource phrasing:

   • Original: "we used 2 nodes of 8xH100 each one..."
   • Revised: "we used 2 nodes, each with 8×H100 GPUs..." Rationale: This rewording removes redundant language ("each one") and more clearly states that each node has eight H100 GPUs.

[lewtun]

Thanks for the fixes!