Monthly Normalization Toolkit Experimental API Docs (github#1469)

* adding docs for monthly normalization toolkit experimental functions

Co-authored-by: Lana Brindley <[email protected]>

api/days_in_month.md

@@ -0,0 +1,36 @@
+---
+api_name: days_in_month()
+excerpt: Calculates days in month given a timestamptz
+license: community
+toolkit: true
+api_experimental: true
+topic: hyperfunctions
+tags: [normalization, hyperfunctions]
+api_category: hyperfunctions
+hyperfunction_toolkit: true
+---
+## days_in_month()
+
+Given a timestamptz, returns how many days are in that month.
+
+### Required arguments
+
+|Name|Type|Description|
+|-|-|-|
+|`date`|`TIMESTAMPTZ`|Timestamp to use to calculate how many days in the month|
+
+### Sample usage
+
+Calculate how many days in the month of January 1, 2022:
+
+```sql
+SELECT toolkit_experimental.days_in_month('2021-01-01 00:00:00+03'::timestamptz)
+```
+
+The output looks like this:
+
+```
+days_in_month
+----------------------
+31
+```

api/month_normalize.md

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+---
+api_name: month_normalize()
+excerpt: Normalization metric based on reference date and days 
+license: community
+toolkit: true
+api_experimental: true
+topic: hyperfunctions
+tags: [normalization, hyperfunctions]
+api_category: hyperfunctions
+hyperfunction_toolkit: true
+---
+## month_normalize()
+
+Normalize the provided metric based on reference date and days.
+
+### Required arguments
+
+|Name|Type|Description|
+|-|-|-|
+|`metric`|`float8`||
+|`reference_date`|`TIMESTAMPTZ`|Timestamp to normalize the metric with|
+|`days`|`float8`|Optional, defaults to 365.25/12 if none provided|
+
+### Sample usage
+
+Get the normalized value for a metric of 1000, and a reference date of January 1, 2021:
+
+```sql
+SELECT toolkit_experimental.month_normalize(1000,'2021-01-01 00:00:00+03'::timestamptz
+```
+
+The output looks like this:
+
+```
+month_normalize
+----------------------
+981.8548387096774
+```