Add changelog and a couple of docs fixes for #860 (#874)

* Add changelog and a couple of docs fixes for #860

* Match `processors` setting format in the table

Author: basepi

CHANGELOG.asciidoc

@@ -39,6 +39,7 @@ endif::[]
 
 * Added graphql (graphene) support {pull}850[#850]
 * Collect cloud provider metadata {pull}826[#826]
+* Added `sanitize_field_names` config {pull}860[#860]
 
 [float]
 ===== Bug fixes

docs/configuration.asciidoc

@@ -634,15 +634,15 @@ to avoid stampedes of instances that start at the same time.
 A list of processors to process transactions and errors.
 For more information, see <<sanitizing-data, Sanitizing Data>>.
 
-WARNING: We recommend to always include the default set of validators if you customize this setting.
+WARNING: We recommend always including the default set of validators if you customize this setting.
 
 [float]
 [[config-sanitize-field-names]]
 ==== `sanitize_field_names`
 
 [options="header"]
 |============
-| Environment              | Django/Flask | Default
+| Environment                        | Django/Flask           | Default
 | `ELASTIC_APM_SANITIZE_FIELD_NAMES` | `SANITIZE_FIELD_NAMES` | `['authorization',
                                                                   'password',
                                                                   'secret',
@@ -656,7 +656,7 @@ WARNING: We recommend to always include the default set of validators if you cus
 A list of field names to mask when using processors.
 For more information, see <<sanitizing-data, Sanitizing Data>>.
 
-WARNING: We recommend to always include the default set of field names if you customize this setting.
+WARNING: We recommend always including the default set of field names if you customize this setting.
 
 
 [float]