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Rollup merge of #69007 - GuillaumeGomez:clean-up-e0283, r=Dylan-DPC 

Clean up E0283 explanation

r? @Dylan-DPC
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src/librustc_error_codes/error_codes/E0283.md
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@ -1,7 +1,6 @@
This error occurs when the compiler doesn't have enough information
to unambiguously choose an implementation.
An implementation cannot be chosen unambiguously because of lack of information.
For example:
Erroneous code example:
```compile_fail,E0283
trait Generator {
@ -27,7 +26,9 @@ fn main() {
}
```
To resolve this error use the concrete type:
This error can be solved by adding type annotations that provide the missing
information to the compiler. In this case, the solution is to use a concrete
type:
```
trait Generator {