doc: update doc for random package

docs/api/packages/random.md

@@ -218,6 +218,32 @@ func main() {
 }
 ```
 
+### <span id="RandSymbolChar">RandSymbolChar</span>
+
+<p>生成给定长度的随机符号字符串. 符号字符包括: !@#$%^&*()_+-=[]{}|;':\",./<>?。</p>
+
+<b>函数签名:</b>
+
+```go
+func RandSymbolChar(length int) string
+```
+
+<b>示例:</b>
+
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/duke-git/lancet/v2/random"
+)
+
+func main() {
+    randStr := random.RandSymbolChar(6)
+    fmt.Println(randStr) //@#(_")
+}
+```
+
 ### <span id="UUIdV4">UUIdV4</span>
 
 <p>生成UUID v4字符串</p>

docs/en/api/packages/random.md

@@ -29,6 +29,7 @@ import (
 -   [RandLower](#RandLower)
 -   [RandNumeral](#RandNumeral)
 -   [RandNumeralOrLetter](#RandNumeralOrLetter)
+-   [RandSymbolChar](#RandSymbolChar)
 -   [UUIdV4](#UUIdV4)
 -   [RandUniqueIntSlice](#RandUniqueIntSlice)
 
@@ -218,6 +219,32 @@ func main() {
 }
 ```
 
+### <span id="RandSymbolChar">RandSymbolChar</span>
+
+<p>Generate a random symbol char of specified length. Symbol chars: !@#$%^&*()_+-=[]{}|;':\",./<>?.</p>
+
+<b>Signature:</b>
+
+```go
+func RandSymbolChar(length int) string
+```
+
+<b>Example:</b>
+
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/duke-git/lancet/v2/random"
+)
+
+func main() {
+    randStr := random.RandSymbolChar(6)
+    fmt.Println(randStr) //@#(_")
+}
+```
+
 ### <span id="UUIdV4">UUIdV4</span>
 
 <p>Generate a random UUID of version 4 according to RFC 4122.</p>