Update descriptions of crates containing runnable components

Description of these crates is shown by clap in CLI help, so the
descriptions were updated to make them more consistent.

- a trailing dot `.` was removed (looking at most popular Rust crates at
  https://lib.rs/std, none of those that have only a single sentence
  have a trailing dot)
- the descriptions were uncapitalized (they consist of a single sentence
  anyway and sometimes start with `thin-edge`)

Signed-off-by: Marcel Guzik <marcel.guzik@cumulocity.com>

Author: Bravo555

crates/core/tedge_mapper/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "tedge-mapper"
-description = "tedge-mapper is the mapper that translates thin-edge.io data model to c8y/az data model."
+description = "tedge-mapper translates thin-edge.io data model to c8y/az/aws data model"
 version = { workspace = true }
 authors = { workspace = true }
 edition = { workspace = true }

crates/core/tedge_watchdog/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "tedge-watchdog"
-description = "tedge-watchdog checks the health of all the thin-edge.io components/services."
+description = "tedge-watchdog checks the health of all the thin-edge.io components/services"
 version = { workspace = true }
 authors = { workspace = true }
 edition = { workspace = true }

plugins/c8y_firmware_plugin/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "c8y-firmware-plugin"
-description = "Thin-edge device firmware management for Cumulocity"
+description = "thin-edge.io device firmware management for Cumulocity"
 version = { workspace = true }
 authors = { workspace = true }
 edition = { workspace = true }

plugins/c8y_remote_access_plugin/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "c8y-remote-access-plugin"
-description = "Thin-edge.io plugin for the Cumulocity IoT's Cloud Remote Access feature"
+description = "thin-edge.io plugin for the Cumulocity Cloud Remote Access feature"
 version = { workspace = true }
 authors = { workspace = true }
 edition = { workspace = true }