Fixing the last pr commments (#4)

* Rephrased the Reference Implementation.

* Changed the heading in Specifications section

* Linked the functions to the headings instead of the footnotes + removed unused footnotes

* Security Considerations redirect - rationale section

* Spell Check 1 + BIP / SLIP removal + the ERC check + Footnote removal & # Update

* motivation topic bolding change

* Motivation FTC Sentence + keyWallet fix + Footnote Reduction Variation 1 + Re-number

* Added _ to some `keyWallet1` & `keyWallet2` + Footnote update

* Motivation FTC section sentence Split

* Rationale - Returns on Bools

* Key Wallet Reduction + anyToken

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Co-authored-by: KBT Admin <kbtstandard@proton.me>
Co-authored-by: NickZCZ <NickKBT@proton.me>
Co-authored-by: MihaiORO <mihaikbt@proton.me>