Corrected style to use one space after period

[VisLab]

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[github-actions]

PR Review: Corrected style to use one space after period

This PR is a clean, purely cosmetic change replacing double spaces after periods with single spaces across the codebase. The scope is consistent and appropriate: only comments, docstrings, error messages, and inline string literals are touched, no logic is affected.

One issue found:

Important — hed/schema/schema_io/hed_id_util.py: One docstring edit silently drops content. The original line read:

df_key(str): The dataframe range type we're interested in.  a key from constants.DF_SUFFIXES.

The new version is:

df_key(str): The dataframe range type we're interested in.

The trailing clause (a key from constants.DF_SUFFIXES.) was removed entirely rather than kept after the corrected single space. This loses useful documentation about valid values for the parameter. The fix is to restore it: 'The dataframe range type we're interested in. A key from constants.DF_SUFFIXES.'

Minor observations (no action required):

• A handful of changes go slightly beyond spacing: adding 'It' before 'does not check value' in attribute_validators.py, adding 'The' before '.tsv files' in two schema_script_util.py print statements, and converting 'Eg' to 'e.g.,' in several docstrings. These are all improvements and fine to include.
• Error message strings are changed in error_messages.py and schema_error_messages.py. HED error reporting is code-based (not string-matched), so these do not affect backward compatibility.

Verdict: Approve once the dropped documentation in hed_id_util.py is restored.