docs: fix typos in AutoETS/AutoCES docstrings and README

[Zhu yizhang (godarrenw)]

Description

Fixes six spelling mistakes: five in the AutoETS / AutoCES docstrings and the model-name validation message, plus one in the README. No identifiers or logic are touched.

Location	Fix
models.py:713 (AutoETS)	$N$ ommited components → omitted
models.py:1017 (AutoCES)	$P$ parial → partial
models.py:1018 (AutoCES)	$N$ ommited components → omitted
models.py:1019 (AutoCES)	simple CES (withous seasonality) → without
models.py:202	"...samples, serie has {n_samples:,}." → series
README.md:38	Vist our [Installation Guide] → Visit

Two of these are self-evident from their immediate surroundings — the same AutoCES docstring already writes partial correctly on line 1020 ($P$ for partial seasonality), and line 1019 itself writes without correctly later in the same sentence (without complex part).

models.py:202 is a message users see: it is raised when there aren't enough samples for prediction intervals.

The four docstring fixes appear on the generated AutoETS and AutoCES API pages.

How I checked

Candidates came from a spellcheck pass, then each was read in context. serie was confirmed to appear exactly once under python/ (everywhere else the code says series), so it is a genuine slip rather than house style. Conversely, lik, ans and nd — which a spellchecker also flags in arima.py / ets.py / ces.py — are real variable names carried over from the R implementation and were left alone.

python -m py_compile passes on models.py. Documentation only, no functional change.

I checked the open documentation PRs for overlap: #1096 also touches python/statsforecast/models.py, but its changes are in the SimpleExponentialSmoothing / SeasonalExponentialSmoothing region (from line ~2246) and do not touch any of the lines above; #1217 and #1220 touch notebooks and CONTRIBUTING.md only.

Disclosure: prepared with AI assistance; each occurrence was read in context and verified manually.

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