x/tools/cmd/godoc: There should be a blank line between a code example and function definition

[0xmohit]

When viewing examples in command line mode, those should be followed by a newline.

For example, below is a snippet of output from godoc -ex strings:

func Contains(s, substr string) bool
    Contains reports whether substr is within s.

    Example:
        fmt.Println(strings.Contains("seafood", "foo"))
        fmt.Println(strings.Contains("seafood", "bar"))
        fmt.Println(strings.Contains("seafood", ""))
        fmt.Println(strings.Contains("", ""))
        // Output:
        // true
        // false
        // true
        // true
func ContainsAny(s, chars string) bool
    ContainsAny reports whether any Unicode code points in chars are within
    s.

    Example:
        fmt.Println(strings.ContainsAny("team", "i"))
        fmt.Println(strings.ContainsAny("failure", "u & i"))
        fmt.Println(strings.ContainsAny("foo", ""))
        fmt.Println(strings.ContainsAny("", ""))
        // Output:
        // false
        // true
        // false
        // false
func ContainsRune(s string, r rune) bool
    ContainsRune reports whether the Unicode code point r is within s.

func Count(s, sep string) int
    Count counts the number of non-overlapping instances of sep in s. If sep
    is an empty string, Count returns 1 + the number of Unicode code points
    in s.

    Example:
        fmt.Println(strings.Count("cheese", "e"))
        fmt.Println(strings.Count("five", "")) // before & after each rune
        // Output:
        // 3
        // 5
func EqualFold(s, t string) bool
    EqualFold reports whether s and t, interpreted as UTF-8 strings, are
    equal under Unicode case-folding.

    Example:
        fmt.Println(strings.EqualFold("Go", "go"))
        // Output: true

[gopherbot]

CL https://golang.org/cl/16329 mentions this issue.