[DOC] Fix a typo in `Integer#chr` example

The current example raises the following error. ```ruby 0..chr # => undefined local variable or method `chr' for main:Object (NameError) ``` This PR updates the example to produce the expected behavior. ```ruby 0.chr # => "\x00" ``` 

1 files changed, 1 insertions, 1 deletions

diff --git a/numeric.c b/numeric.c
index 61f93c4f01..0e33c0f4ba 100644
--- a/numeric.c
+++ b/numeric.c
@@ -3775,7 +3775,7 @@ rb_enc_uint_chr(unsigned int code, rb_encoding *enc)
 * represented by the value of +self+, according to the given +encoding+.
 *
 * 65.chr # => "A"
- * 0..chr # => "\x00"
+ * 0.chr # => "\x00"
 * 255.chr # => "\xFF"
 * string = 255.chr(Encoding::UTF_8)
 * string.encoding # => Encoding::UTF_8