Remove #[doc(hidden)] from implementation section

[xgreenx]

Fixes #1269

Removed #[doc(hidden)] from the implementation section because now it fully depends on the trait definition. __ink_TraitInfo is hidden in the trait - it is enough.

[paritytech-cicd-pr]

🦑 📈 ink! Example Contracts ‒ Changes Report 📉 🦑

These are the results when building the examples/* contracts from this branch with cargo-contract 1.3.0-cef152e and comparing them to ink! master:

	Δ Optimized Size	Δ Used Gas	Total Optimized Size	Total Used Gas
accumulator			1.04 K
adder			2.13 K
contract-introspection			2.37 K
contract-terminate			0.94 K	275_000
contract-transfer			8.13 K	75_000
data-structures			1.73 K
delegate-calls			2.96 K	76_276
delegator			6.38 K	232_281
dns			8.89 K	225_000
erc1155			17.30 K	450_000
erc20			8.49 K	225_000
erc721			11.82 K	600_000
flipper			1.31 K	75_000
forward-calls			2.88 K	151_427
incrementer			1.21 K
mother			12.36 K
multisig			25.29 K	470_275
rand-extension			3.92 K	75_000
seal-code-hash			1.58 K
seal-ecdsa			1.81 K
set-code-hash			1.57 K	150_000
subber			2.15 K
trait-erc20			8.77 K	225_000
trait-flipper			1.00 K	75_000
trait-incrementer			1.19 K	150_000
updated-incrementer			9.62 K
upgradeable-flipper			1.55 K

Link to the run | Last update: Sun May 22 21:30:14 CEST 2022

[codecov-commenter]

Codecov Report

Merging #1272 (5860be9) into master (64d5fd4) will increase coverage by 18.47%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1272       +/-   ##
===========================================
+ Coverage   47.93%   66.41%   +18.47%     
===========================================
  Files         176      176               
  Lines        5916     5916               
===========================================
+ Hits         2836     3929     +1093     
+ Misses       3080     1987     -1093     

Impacted Files	Coverage Δ
...odegen/src/generator/as_dependency/contract_ref.rs	100.00% <ø> (+100.00%)	⬆️
...ng/codegen/src/generator/trait_def/call_builder.rs	100.00% <ø> (+100.00%)	⬆️
.../codegen/src/generator/trait_def/call_forwarder.rs	100.00% <ø> (+100.00%)	⬆️
.../codegen/src/generator/trait_def/trait_registry.rs	98.92% <ø> (+98.92%)	⬆️
crates/lang/ir/src/ir/selector.rs	80.00% <0.00%> (+8.00%)	⬆️
crates/lang/ir/src/ir/item_impl/callable.rs	87.87% <0.00%> (+10.10%)	⬆️
crates/lang/codegen/src/generator/ink_test.rs	75.00% <0.00%> (+75.00%)	⬆️
crates/lang/codegen/src/generator/dispatch.rs	94.31% <0.00%> (+94.31%)	⬆️
...ates/lang/codegen/src/generator/chain_extension.rs	95.74% <0.00%> (+95.74%)	⬆️
crates/lang/codegen/src/generator/events.rs	97.26% <0.00%> (+97.26%)	⬆️
... and 19 more

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