docs: Fix a few typos (#606)

* docs: Fix a few typos

There are small typos in:
- doc/versioning.md
- src/components/ble/NimbleController.cpp
- src/libs/mynewt-nimble/CODING_STANDARDS.md
- src/libs/mynewt-nimble/docs/btshell/btshell_GAP.rst
- src/systemtask/SystemTask.cpp

Fixes:
- Should read `milliseconds` rather than `miliseconds`.
- Should read `unnecessary` rather than `uncesseray`.
- Should read `target` rather than `tharget`.
- Should read `project` rather than `projct`.
- Should read `preferred` rather than `prefered`.
- Should read `functioning` rather than `functionning`.
- Should read `forever` rather than `forver`.
- Should read `existing` rather than `exisiting`.

2 files changed, 2 insertions, 2 deletions

diff --git a/src/components/ble/NimbleController.cpp b/src/components/ble/NimbleController.cpp
index 5eb227b..bde9b07 100644
--- a/src/components/ble/NimbleController.cpp
+++ b/src/components/ble/NimbleController.cpp
@@ -126,7 +126,7 @@ void NimbleController::StartAdvertising() {
   //  ASSERT(res == 0);// TODO I've disabled these ASSERT as they sometime asserts and reset the mcu.
   // For now, the advertising is restarted as soon as it ends. There may be a race condition
   // that prevent the advertising from restarting reliably.
-  // I remove the assert to prevent this uncesseray crash, but in the long term, the management of
+  // I remove the assert to prevent this unnecessary crash, but in the long term, the management of
   // the advertising should be improve (better error handling, and advertise for 3 minutes after
   // the application has been woken up, for example.
 }
diff --git a/src/systemtask/SystemTask.cpp b/src/systemtask/SystemTask.cpp
index d9434b3..690a453 100644
--- a/src/systemtask/SystemTask.cpp
+++ b/src/systemtask/SystemTask.cpp
@@ -350,7 +350,7 @@ void SystemTask::Work() {
       if (bleDiscoveryTimer == 0) {
         isBleDiscoveryTimerRunning = false;
         // Services discovery is deffered from 3 seconds to avoid the conflicts between the host communicating with the
-        // tharget and vice-versa. I'm not sure if this is the right way to handle this...
+        // target and vice-versa. I'm not sure if this is the right way to handle this...
         nimbleController.StartDiscovery();
       } else {
         bleDiscoveryTimer--;