Implement `try_mutate` for storage value and storage double map (#5699)
* impl try_mutate for storage value and storage double map * Docs + Reuse `try_mutate` in `mutate`
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- substrate/frame/support/src/dispatch.rs 1 addition, 5 deletionssubstrate/frame/support/src/dispatch.rs
- substrate/frame/support/src/error.rs 1 addition, 1 deletionsubstrate/frame/support/src/error.rs
- substrate/frame/support/src/lib.rs 4 additions, 0 deletionssubstrate/frame/support/src/lib.rs
- substrate/frame/support/src/storage/generator/double_map.rs 14 additions, 4 deletionssubstrate/frame/support/src/storage/generator/double_map.rs
- substrate/frame/support/src/storage/generator/map.rs 3 additions, 19 deletionssubstrate/frame/support/src/storage/generator/map.rs
- substrate/frame/support/src/storage/generator/mod.rs 52 additions, 0 deletionssubstrate/frame/support/src/storage/generator/mod.rs
- substrate/frame/support/src/storage/generator/value.rs 15 additions, 4 deletionssubstrate/frame/support/src/storage/generator/value.rs
- substrate/frame/support/src/storage/mod.rs 26 additions, 0 deletionssubstrate/frame/support/src/storage/mod.rs
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