doc: update usage and limitation

Author: Abirdcfly

README.md

@@ -60,7 +60,8 @@ go install github.com/Abirdcfly/dupword/cmd/dupword@main
 ### 1. default
 
 Run with default settings(include test file):
-**But note that not all repeated words are wrong**
+
+**But note that not all repeated words are wrong** see [dupword#4](https://github.com/Abirdcfly/dupword/issues/4) for real code example.
 
 ```bash
 $ dupword ./...
@@ -127,7 +128,9 @@ Flags:
 
 ### 5. my advice
 
-use `--keyword=the,and,a` and `-fix` together.
+use `--keyword=the,and,a` and `-fix` together. I personally think that specifying only common repeated prepositions can effectively avoid false positives. 
+
+see [dupword#4](https://github.com/Abirdcfly/dupword/issues/4) for real code example.
 
 ```bash
 $ dupword --keyword=the,and,a -fix ./...
@@ -141,8 +144,7 @@ $ dupword --keyword=the,and,a -fix ./...
 ## Limitation
 
 1. Only for `*.go` file.But some miswritten occurs in `*.md` or `*.json` file.(example: kubernetes), In this case, my advice is to use [rg](https://github.com/BurntSushi/ripgrep) to do the lookup and replace manually.
-2. The first time, `-fix` args can't auto-fix `*_test.go` file, you need to run the command once again, this is a bug of golang/x/tools, see [https://github.com/golang/go/issues/54740](https://github.com/golang/go/issues/54740) for more information and it will be fixed by ~~[CL 426594](https://go-review.googlesource.com/c/tools/+/426594)~~ [CL 426734](https://go-review.googlesource.com/c/tools/+/426734/) . (ps: This problem occurs with basically all linters that use the `go/analysis` package), In this case, my advice is to run the linter command multiple times.:sweat_smile:
-3. When use `-fix`, also running `go fmt` in the dark.([This logic is determined upstream](https://github.com/golang/tools/blob/248c34b88a4148128f89e41923498bd86f805b7d/go/analysis/internal/checker/checker.go#L424-L433), the project does not have this part of the code.)
+2. When use `-fix`, also running `go fmt` in the dark.([This logic is determined upstream](https://github.com/golang/tools/blob/248c34b88a4148128f89e41923498bd86f805b7d/go/analysis/internal/checker/checker.go#L424-L433), the project does not have this part of the code.)
 
 ## License