docs: fix typos in Scaladoc comments and examples

[Avicennasis]

Summary

Fix 30 spelling and grammar typos in Scaladoc comments, code comments and the
example projects. Documentation/comments only -- no code, identifiers or public
API names were changed, so behaviour is unaffected.

Findings from the report

timeseries/.../timeseries/package.scala

• defines how it mnaps -> defines how it maps
• the Scheduler ensure that -> ensures (subject/verb agreement)
• The scheduler also allow to -> also allows to
• Utility that allow to define -> allows to define
• immediatly -> immediately (3 occurrences: hourly, daily, monthly -- the
  weekly block already spells it correctly)
• Defines an daily calendar -> a daily calendar
• starting a midnight -> starting at midnight
• timezone defines lightsaving ... 23 or 25 horus -> daylight saving ... hours

timeseries/.../timeseries/CuttleProject.scala

• providing an Web UI -> a Web UI
• @param description The project version as displayed in the UI. ->
  The project description ... (copy/paste from the @param version line above)
• internal debug informations -> information

cron/.../cron/CronProject.scala

• providing an Web UI -> a Web UI
• Create new projects using a timeseries scheduler. -> a cron scheduler.
  (copy/paste from CuttleProject; this is the cron project object)
• @param description The project version as displayed in the UI. ->
  The project description ...
• internal debug informations -> information

examples/.../HelloTimeSeries.scala

• // This a very simple cuttle project -> This is a very simple
• is just embeded into -> embedded
• create a single executions for each 5 consequent partition ->
  a single execution for each 5 consequent partitions

core/.../Utils.scala

• that resolve automatically -> resolves (3 occurrences)

Additionally noticed

While checking the above I found the same misspellings a few files over and
fixed them in this branch too, so the codebase is consistent:

• core/.../Logger.scala: output internal informations -> information
• core/.../Scheduling.scala: A scheduler interpret ... and instanciate ->
  interprets ... instantiates; Immediatly the scheduler -> Immediately;
  debug state if neeed -> if needed; statistics informations -> information
• timeseries/.../TimeSeriesScheduler.scala: the [[Backfill]] informations are provided -> information is provided
• examples/.../HelloCustomScheduling.scala: is just embeded into -> embedded

Deliberately left alone

• RetryStrategy.SimpleRetryStategy -- the misspelling is real, but it is a
  public API name defined in core/.../Executor.scala; renaming it would be a
  source-breaking change, so it is out of scope for a typo PR.
• val splitted in core/.../Authentication.scala -- a local identifier.
• allow(s) to <verb> -- used consistently 16 times across the repo, so it is
  house style rather than a typo; only the subject/verb agreement was corrected.
• instanciate a trasactor in core/src/it/.../DatabaseITest.scala -- a test
  name string; happy to include it if you would like it fixed too.

No functional changes -- comments and documentation only.