Original text:
or the dynamic table using an instruction that starts with the '1' one-bit pattern.  The second ("S") bit indicates whether the reference is to the static or dynamic table.  The 6-bit prefix <del> integer (see Section 5.1 of RFC7541) that follows is used to locate the table entry for the header name.  When S=1, the number represents the static table index; when S=0, the number is the relative index of the entry in the dynamic table. </del>  The header name reference is followed by the header field value <del> represented as a string literal (see Section 5.2 of RFC7541). </del>  4.3.3. An encoder adds an entry to the dynamic table where both the header field name and the header field value are represented as string <del> literals (see primitives) using an instruction that starts with the '01' two-bit pattern. </del>  <del> The name is represented as a 6-bit prefix string literal, while the value is represented as an 8-bit prefix string literal. </del>  4.3.4. An encoder duplicates an existing entry in the dynamic table using an <del> instruction that starts with the '000' three-bit pattern.  The relative index of the existing entry is represented as an integer with a 5-bit prefix. </del>  The existing entry is re-inserted into the dynamic table without resending either the name or the value.  This is useful to mitigate

Reviewer comments:
Use more uniform and more specific language in description of instructions, like "follows" instead of "includes" or implicit mention of a field. Add references to integer and string encodings where missing. Prefer internal references to external ones (also in Section 1.2). Explicitly allow a header block to not have any instructions after the mandatory prefix. Refer to Literal Header Field With Name Reference section in Literal Header Field Without Name Reference instead of verbatim repeating text on 'N' bit. Reshuffle sentences, insert references instead, remove sentences where references suffice.
Mostly good improvements; a few things to fix up further.

Revised text:
or the dynamic table using an instruction that starts with the '1' one-bit pattern.  The second ("S") bit indicates whether the reference is to the static or dynamic table.  The 6-bit prefix  <ins> integer (see prefixed-integers) that follows is used to locate the table entry for the header name.  When S=1, the number represents the static table index; when S=0, the number is the relative index of the entry in the dynamic table. </ins> The header name reference is followed by the header field value  <ins> represented as a string literal (see string-literals). </ins> 4.3.3. An encoder adds an entry to the dynamic table where both the header field name and the header field value are represented as string  <ins> literals using an instruction that starts with the '01' two-bit pattern. </ins>  <ins> This is followed by the name represented as a 6-bit prefix string literal, and the value represented as an 8-bit prefix string literal (see string-literals). </ins> 4.3.4. An encoder duplicates an existing entry in the dynamic table using an  <ins> instruction that begins with the '000' three-bit pattern.  This is followed by the relative index of the existing entry represented as an integer with a 5-bit prefix (see prefixed-integers. </ins> The existing entry is re-inserted into the dynamic table without resending either the name or the value.  This is useful to mitigate