Update doxygen and release commits of SigV4 and Fleet Provisioning (#1707)

Author: aggarw13

docs/doxygen/config.doxyfile

@@ -2243,7 +2243,8 @@ TAGFILES               = libraries/standard/coreMQTT/docs/doxygen/output/mqtt.ta
                          libraries/aws/jobs-for-aws-iot-embedded-sdk/docs/doxygen/output/jobs.tag=../../../../libraries/aws/jobs-for-aws-iot-embedded-sdk/docs/doxygen/output/html \
                          libraries/standard/backoffAlgorithm/docs/doxygen/output/backoffalgorithm.tag=../../../../libraries/standard/backoffAlgorithm/docs/doxygen/output/html \
                          libraries/aws/ota-for-aws-iot-embedded-sdk/docs/doxygen/output/ota.tag=../../../../libraries/aws/ota-for-aws-iot-embedded-sdk/docs/doxygen/output/html \
-                         libraries/aws/fleet-provisioning-for-aws-iot-embedded-sdk/docs/doxygen/output/fleet_provisioning.tag=../../../../libraries/aws/fleet-provisioning-for-aws-iot-embedded-sdk/docs/doxygen/output/html
+                         libraries/aws/fleet-provisioning-for-aws-iot-embedded-sdk/docs/doxygen/output/fleet_provisioning.tag=../../../../libraries/aws/fleet-provisioning-for-aws-iot-embedded-sdk/docs/doxygen/output/html \
+                         libraries/aws/sigv4-for-aws-iot-embedded-sdk/docs/doxygen/output/sigV4.tag=../../../../libraries/aws/sigv4-for-aws-iot-embedded-sdk/docs/doxygen/output/html
 
 
 # When a file name is specified after GENERATE_TAGFILE, doxygen will create a

docs/doxygen/pages.dox

@@ -13,4 +13,5 @@ The following libraries (along with their source repositories) are part of this
 - [AWS IoT Jobs client](@ref jobs) - [jobs-for-aws-iot-embedded-sdk](https://github.com/aws/jobs-for-aws-iot-embedded-sdk)
 - [AWS IoT Over-the-air Update Library](@ref ota) - [ota-for-aws-iot-embedded-sdk](https://github.com/aws/ota-for-aws-iot-embedded-sdk)
 - [AWS IoT Fleet Provisioning Library](@ref fleet_provisioning) - [fleet-provisioning-for-aws-iot-embedded-sdk](https://github.com/aws/fleet-provisioning-for-aws-iot-embedded-sdk)
+- [AWS SigV4 Library](@ref sigv4) - [sigv4-for-aws-iot-embedded-sdk](https://github.com/aws/sigv4-for-aws-iot-embedded-sdk)
 */