Update README.md

Fix broken doc link

Author: StephenMolloy

README.md

@@ -22,7 +22,7 @@ For more information about Configuration Builders and the features and builders
   * Added *RecursionGuard* to help detect and prevent situations where a `ConfigurationBuilder` accessing values from a `ConfigurationSection` other than the one which it is currently processing could result in stack overflow.
   * `optional` attribute is obsolete => [`enabled`](docs/KeyValueConfigBuilders.md#enabled) attribute which provides more versatility. (The `optional` attribute is still parsed and recognized in the absence of the newer [`enabled`](docs/KeyValueConfigBuilders.md#enabled) attribute, but builders should migrate to use the new attribute name when possible. Installation scripts should try to handle this automatically.)
   * Character Mapping - Some config builders have had an internal mapping of characters that might exist in keys in the config file but are illegal in keys at the source. As more scenarios come to light and individual prefrences are not always unanimous, V3 instead adds the [`charMap`](docs/KeyValueConfigBuilders.md#charmap) attribute to allow this character mapping to work with all **KeyValueConfigBuilders** and to be handled in an easily configurable manner.
-  * `ConnectionStringsSectionHandler2` - A new section handler for the `<connectionStrings>` section has been included in the base package. This new handler will allow updating of both the 'connectionString' attribute as well as the 'providerName' attribute. It does require the builders and source of config data to be aware of this new ability though. The default section handler for the `<connectionStrings>` section has not been updated and remains as it was in previous versions, so apps wishing to take advantage of the new handler will have to wire it up in their config. More details can be found in the [SectionHandlers documentation](docs/SetionHandlers.md#ConnectionStringsSectionHandler2).
+  * `ConnectionStringsSectionHandler2` - A new section handler for the `<connectionStrings>` section has been included in the base package. This new handler will allow updating of both the 'connectionString' attribute as well as the 'providerName' attribute. It does require the builders and source of config data to be aware of this new ability though. The default section handler for the `<connectionStrings>` section has not been updated and remains as it was in previous versions, so apps wishing to take advantage of the new handler will have to wire it up in their config. More details can be found in the [SectionHandlers documentation](docs/SectionHandlers.md#ConnectionStringsSectionHandler2).
   * `AzureAppConfiguration` nuget package version is revved to match the rest of this suite of builders, rather than being 1 major version behind. (ie, `AzureAppConfiguration:3.0` now depends on `Base:3.0` rather than `AzureAppConfiguration:1.0` depending on `Base:2.0`)
 
 ### V2 Updates: