make docs

Author: julienduchesne

docs/string.md

@@ -13,6 +13,7 @@ local string = import "github.com/jsonnet-libs/xtd/string.libsonnet"
 ## Index
 
 * [`fn splitEscape(str, c, escape='\\')`](#fn-splitescape)
+* [`fn strReplaceMulti(str, replacements)`](#fn-strreplacemulti)
 
 ## Fields
 
@@ -24,3 +25,18 @@ splitEscape(str, c, escape='\\')
 
 `split` works the same as `std.split` but with support for escaping the dividing
 string `c`.
+
+
+### fn strReplaceMulti
+
+```ts
+strReplaceMulti(str, replacements)
+```
+
+`strReplaceMulti` replaces multiple substrings in a string.
+
+Example:
+```jsonnet
+strReplaceMulti('hello world', [['hello', 'goodbye'], ['world', 'universe']])
+// 'goodbye universe'
+```