doc: add __abi-generate features to docs generated

[dj8yfo]

It's not convenient that JsonSchema/BorshSchema cannot be checked on docs
https://docs.rs/near-sdk/5.7.0/near_sdk/struct.PublicKey.html of various types,
for being implemented or not.

• "__abi-generate" should be added here

  near-sdk-rs/near-sdk/Cargo.toml

  Line 101 in 1898971

  features = ["unstable", "legacy", "unit-testing", "__macro-docs"]

• change

  [package.metadata.docs.rs]
  features = ["__abi-generate"]

  here https://github.com/near/near-sdk-rs/blob/master/near-sdk-macros/Cargo.toml#L31

• following diff applied here https://github.com/near/near-sdk-rs/blob/master/near-contract-standards/Cargo.toml

diff --git a/near-contract-standards/Cargo.toml b/near-contract-standards/Cargo.toml
index e4ab1dfe..ccc8dcba 100644
--- a/near-contract-standards/Cargo.toml
+++ b/near-contract-standards/Cargo.toml
@@ -24,4 +24,7 @@ near-sdk = { path = "../near-sdk", default-features = false, features = [

+[package.metadata.docs.rs]
+features = ["abi"]
+
 [features]
 default = []
-abi = ["near-sdk/abi"]
+abi = ["near-sdk/__abi-generate"]

• following diff applied here https://github.com/near/near-sdk-rs/blob/master/.github/workflows/test.yml#L126-L128

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 06bda06c..ca9fb168 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -125,5 +125,5 @@ jobs:
       run: |
-        cargo doc -p near-sdk --features unstable,legacy,unit-testing,__macro-docs
-        cargo doc -p near-sdk-macros
-        cargo doc -p near-contract-standards --no-deps
+        cargo doc -p near-sdk --features unstable,legacy,unit-testing,__macro-docs,__abi-generate
+        cargo doc -p near-sdk-macros --features __abi-generate
+        cargo doc -p near-contract-standards --no-deps --features abi
         cargo doc -p near-sys