Update projects_system_design.html

projects_system_design.html

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-  This diagram describes a general design for a backfill system of a feature service that consumes data at two frequencies. Lower frequency data is less accurate but highly available and consistent. Higher frequency data has frequent outages and anomalies. Therefore the data needs to be backfilled regularly as low frequency data is ingested. Targeted backfills are also executed and when there are code changes impacting transformations.
+  This diagram describes a general design for a backfill system of a feature service that consumes data at two frequencies. Lower frequency data is less accurate but highly available and consistent. Higher frequency data has frequent outages and anomalies. Therefore the data needs to be backfilled regularly as low frequency data is ingested. Targeted backfills are also executed when there are code changes impacting transformations.
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