Add descriptions of the missing options to document (#824)

* Add document of `:fast` option in `:bigdecimal_load`

This option was introduced at 80bee00

* Add document of `:ruby` option in `:bigdecimal_load`

This option was introduced at 3c1c896

* Add document of `:slash` option in `:escape_mode`

This option was introduced at f1e7748

* Fix typo

ext/oj/oj.c

@@ -243,15 +243,15 @@ struct _options oj_default_options = {
  *references
  * - *:auto_define* [_Boolean_|_nil_] automatically define classes if they do not exist
  * - *:symbol_keys* [_Boolean_|_nil_] use symbols instead of strings for hash keys
- * - *:escape_mode* [_:newline_|_:json_|_:xss_safe_|_:ascii_|_unicode_xss_|_nil_] determines the
+ * - *:escape_mode* [_:newline_|_:json_|_:slash_|_:xss_safe_|_:ascii_|_:unicode_xss_|_nil_] determines the
  *characters to escape
  * - *:class_cache* [_Boolean_|_nil_] cache classes for faster parsing (if dynamically modifying
  *classes or reloading classes then don't use this)
  * - *:mode* [_:object_|_:strict_|_:compat_|_:null_|_:custom_|_:rails_|_:wab_] load and dump modes
  *to use for JSON
  * - *:time_format* [_:unix_|_:unix_zone_|_:xmlschema_|_:ruby_] time format when dumping
  * - *:bigdecimal_as_decimal* [_Boolean_|_nil_] dump BigDecimal as a decimal number or as a String
- * - *:bigdecimal_load* [_:bigdecimal_|_:float_|_:auto_|_:fast_] load decimals as BigDecimal instead
+ * - *:bigdecimal_load* [_:bigdecimal_|_:float_|_:auto_|_:fast_|_:ruby_] load decimals as BigDecimal instead
  *of as a Float. :auto pick the most precise for the number of digits. :float should be the same as
  *ruby. :fast may require rounding but is must faster.
  * - *:compat_bigdecimal* [_true_|_false_] load decimals as BigDecimal instead of as a Float when in

pages/Options.md

@@ -66,6 +66,10 @@ Determines how to load decimals.
 
  - `:auto` the most precise for the number of digits is used.
 
+ - `:fast` faster conversion to Float.
+
+ - `:ruby` convert to Float using the Ruby `to_f` conversion.
+
 This can also be set with `:decimal_class` when used as a load or
 parse option to match the JSON gem. In that case either `Float`,
 `BigDecimal`, or `nil` can be provided.
@@ -154,6 +158,8 @@ Determines the characters to escape when dumping. Only the :ascii and
 
  - `:json` follows the JSON specification. This is the default mode.
 
+ - `:slash` escapes `/` characters.
+
  - `:xss_safe` escapes HTML and XML characters such as `&` and `<`.
 
  - `:ascii` escapes all non-ascii or characters with the hi-bit set.