add try_vaccinate_1m

Author: nmdefries

docs/api/covidcast-signals/fb-survey.md

@@ -320,7 +320,7 @@ unweighted signals are also available. These begin `smoothed_`, such as
 | Signal | Description | Survey Item | Introduced |
 | --- | --- | --- | --- |
 | `smoothed_wothers_distanced_public` | Estimated percentage of respondents who reported that all or most people they enountered in public in the past 7 days maintained a distance of at least 6 feet. Respondents who said that they have not been in public for the past 7 days are excluded. <br/> **Earliest date available:** 2021-06-10 | H1 | Wave 11, May 19, 2021 |
-| `smoothed_wpublic_transit_1d` | Estimated percentage of respondents who "used public transit" in the past 24 hours <br/> **Earliest date available:** 2020-09-08 | C13, C13b | Wave 4, Sept 8, 2020 |
+| `smoothed_wpublic_transit_1d` | Estimated percentage of respondents who "used public transit" in the past 24 hours <br/> **Earliest date available:** 2020-09-08 | C13 or C13b | Wave 4, Sept 8, 2020 |
 | `smoothed_wtravel_outside_state_7d` | Estimated percentage of respondents who report traveling outside their state in the past 7 days. This item was asked of respondents starting in Wave 10. <br/> **Earliest date available:** 2021-03-02 | C6a | Wave 10 |
 | `smoothed_wwork_outside_home_indoors_1d` | Estimated percentage of respondents who worked or went to school indoors and outside their home in the past 24 hours <br/> **Earliest date available:** 2021-03-02 | C13b | Wave 10, Mar 2, 2021 |
 | `smoothed_wshop_indoors_1d` | Estimated percentage of respondents who went to an "indoor market, grocery store, or pharmacy" in the past 24 hours <br/> **Earliest date available:** 2021-03-02 | C13b | Wave 10, Mar 2, 2021 |
@@ -391,6 +391,7 @@ unweighted signals are also available. These begin `smoothed_`, such as
 | `smoothed_wappointment_not_vaccinated` | Estimated percentage of respondents who have an appointment to get a COVID-19 vaccine, among respondents who have not yet been vaccinated. <br/> **Earliest date available:** 2021-05-19 | V11a |
 | `smoothed_wreceived_2_vaccine_doses` | Estimated percentage of respondents who have received two doses of a COVID-19 vaccine, among respondents who have received either one or two doses of a COVID-19 vaccine. This item was shown to respondents starting in Wave 7. <br/> **Earliest date available:** 2021-02-06 | V2 |
 | `smoothed_wcovid_vaccinated_friends` | Estimated percentage of respondents who report that most of their friends and family have received a COVID-19 vaccine. <br/> **Earliest date available:** 2021-08-10 | H3 |
+| `smoothed_wtry_vaccinate_1m` | Estimated percentage of respondents who report that they will try to get the COVID-19 vaccine within a week to a month. <br/> **Earliest date available:** 2021-06-10 | V16 |
 
 ### Barriers to Accessing Vaccination