Autogenerate missing docs (#3514)

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docs/commands/seq-date.md

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+# seq date
+print sequences of dates
+
+## Usage
+```shell
+> seq date {flags} 
+ ```
+
+## Flags
+* -h, --help: Display this help message
+* -s, --separator <string>: separator character (defaults to \n)
+* -o, --output_format <string>: prints dates in this format (defaults to %Y-%m-%d)
+* -i, --input_format <string>: give argument dates in this format (defaults to %Y-%m-%d)
+* -b, --begin_date <string>: beginning date range
+* -e, --end_date <string>: ending date
+* -n, --increment <integer>: increment dates by this number
+* -d, --days <integer>: number of days to print
+* -r, --reverse: print dates in reverse
+
+## Examples
+  print the next 10 days in YYYY-MM-DD format with newline separator
+```shell
+> seq date --days 10
+ ```
+
+  print the previous 10 days in YYYY-MM-DD format with newline separator
+```shell
+> seq date --days 10 -r
+ ```
+
+  print the previous 10 days starting today in MM/DD/YYYY format with newline separator
+```shell
+> seq date --days 10 -o '%m/%d/%Y' -r
+ ```
+
+  print the first 10 days in January, 2020
+```shell
+> seq date -b '2020-01-01' -e '2020-01-10'
+ ```
+
+  print every fifth day between January 1st 2020 and January 31st 2020
+```shell
+> seq date -b '2020-01-01' -e '2020-01-31' -n 5
+ ```
+
+  starting on May 5th, 2020, print the next 10 days in your locale's date format, colon separated
+```shell
+> seq date -o %x -s ':' -d 10 -b '2020-05-01'
+ ```
+