Update accumulator.rs

[Noisyxl]

Changes

1. snark-verifier/src/pcs/kzg/accumulator.rs

• Old: "Since in circuit everything are in scalar field..."
• New: "Since in circuit everything is in scalar field..."
• Old: "The const generic LIMBS and BITS respectively represents..."
• New: "The const generic LIMBS and BITS respectively represent..."

Reason: Fixed subject-verb agreement for better grammatical accuracy.

2. snark-verifier/src/system/halo2/transcript/halo2.rs

• Old: "Instructions to encode/decode a elliptic curve point..."
• New: "Instructions to encode/decode an elliptic curve point..."

Reason: Fixed incorrect article usage ("a" to "an" before word starting with vowel sound).