docs: Update example to match new gem namespace (sql-processor) (#1782)

Author: jukra

helpers/sql-processor/README.md

@@ -43,7 +43,7 @@ Check [New Relic's SQL Obfuscation Helpers module][new-relic-obfuscation-helpers
 To obfuscate sql in your library:
 
 ```ruby
-OpenTelemetry::Helpers::SqlObfuscation.obfuscate_sql(sql, obfuscation_limit: config[:obfuscation_limit], adapter: :postgres)
+OpenTelemetry::Helpers::SqlProcessor.obfuscate_sql(sql, obfuscation_limit: config[:obfuscation_limit], adapter: :postgres)
 ```
 
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