docs: add note explaining opinionated presets (#2313)

* docs: add notes explaining presets

* fix links for mint function

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

contracts/token/ERC1155/README.adoc

@@ -14,6 +14,8 @@ Additionally there are multiple custom extensions, including:
 * designation of addresses that can pause token transfers for all users ({ERC1155Pausable}).
 * destruction of own tokens ({ERC1155Burnable}).
 
+NOTE: This core set of contracts is designed to be unopinionated, allowing developers to access the internal functions in ERC1155 (such as <<ERC1155-_mint-address-uint256-uint256-bytes-,`_mint`>>) and expose them as external functions in the way they prefer. On the other hand, xref:ROOT:erc1155.adoc#Presets[ERC1155 Presets] (such as {ERC1155PresetMinterPauser}) are designed using opinionated patterns to provide developers with ready to use, deployable contracts.
+
 == Core
 
 {{IERC1155}}

contracts/token/ERC20/README.adoc

@@ -24,6 +24,8 @@ Finally, there are some utilities to interact with ERC20 contracts in various wa
 * {SafeERC20} is a wrapper around the interface that eliminates the need to handle boolean return values.
 * {TokenTimelock} can hold tokens for a beneficiary until a specified time.
 
+NOTE: This core set of contracts is designed to be unopinionated, allowing developers to access the internal functions in ERC20 (such as <<ERC20-_mint-address-uint256-,`_mint`>>) and expose them as external functions in the way they prefer. On the other hand, xref:ROOT:erc20.adoc#Presets[ERC20 Presets] (such as {ERC20PresetMinterPauser}) are designed using opinionated patterns to provide developers with ready to use, deployable contracts.
+
 == Core
 
 {{IERC20}}

contracts/token/ERC721/README.adoc

@@ -16,6 +16,9 @@ Additionally there are multiple custom extensions, including:
 * designation of addresses that can pause token transfers for all users ({ERC721Pausable}).
 * destruction of own tokens ({ERC721Burnable}).
 
+NOTE: This core set of contracts is designed to be unopinionated, allowing developers to access the internal functions in ERC721 (such as <<ERC721-_mint-address-uint256-,`_mint`>>) and expose them as external functions in the way they prefer. On the other hand, xref:ROOT:erc721.adoc#Presets[ERC721 Presets] (such as {ERC721PresetMinterPauserAutoId}) are designed using opinionated patterns to provide developers with ready to use, deployable contracts.
+
+
 == Core
 
 {{IERC721}}