Fix: CAIP-350 typos and misheadings

[paperclip-minim]

The CAIP-350 template has the following problems:

• Some sections that shouldn't be siblings (in terms of headings) are siblings
• There's a dash instead of an arrow for customary to text conversion
• The customary<->text and native<->text conversion subsections use 'representation' redundantly, while the analogous binary<->text subsections don't.

The current structure is

[H2] Namespace Reference
[H2] Chain reference
  [H3] Text representation
      [H5] Text representation -> customary (CAIP-2) conversion
      [H5] Customary (CAIP-2) conversion - text representation conversion
    [H4] Binary representation
    [H4] Text -> binary conversion
    [H4] Binary -> text conversion
    [H4] Examples
[H2] Addresses
  [H3] Text representation
      [H5] Text representation -> native representation conversion
      [H5] Native representation -> text representation conversion
    [H4] Binary representation
    [H4] Text -> binary conversion
    [H4] Binary -> text conversion
    [H4] Examples
  [H3] Error handling
  [H3] Implementation considerations
  [H3] Extra considerations

This is also true for every profile derived from it. The Solana profile also has a stray question mark in the customary to text conversion section.

This PR simultaneously fixes all of these section names and heading levels.

[H2] Namespace Reference
[H2] Chain reference
  [H3] Text representation
    [H4] Text -> customary (CAIP-2) conversion
    [H4] Customary (CAIP-2) -> text conversion
  [H3] Binary representation
    [H4] Text -> binary conversion
    [H4] Binary -> text conversion
  [H3] Examples
[H2] Addresses
  [H3] Text representation
    [H4] Text -> native conversion
    [H4] Native -> text conversion
  [H3] Binary representation
    [H4] Text -> binary conversion
    [H4] Binary -> text conversion
  [H3] Examples
[H2] Error handling
[H2] Implementation considerations
[H2] Extra considerations

Everything else is left untouched

[0xrcinus]

Makes sense to me