update reference.md
This is followup of https://gn-review.googlesource.com/c/gn/+/19820
Change-Id: I11aa2becececdb4561c7eec81edf5a6f8491f5cd
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/19900
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@google.com>
diff --git a/docs/reference.md b/docs/reference.md
index 6e99270..81be9b3 100644
--- a/docs/reference.md
+++ b/docs/reference.md
@@ -3048,24 +3048,19 @@
result = label_matches("//baz:bar", [ "//foo/bar/*", "//baz:*" ])
# result will be true
```
-
### <a name="func_len"></a>**len**: Returns the length of a string or a list. [Back to Top](#gn-reference)
```
len(item)
-```
-
-#### **Argument**
The argument can be a string or a list.
+```
-#### **Examples**
-
+#### **Examples**:
```
len("foo") # 3
len([ "a", "b", "c" ]) # 3
```
-
### <a name="func_not_needed"></a>**not_needed**: Mark variables from scope as not needed. [Back to Top](#gn-reference)
```
