mdoc nitpicking for gsched.8 - remove stray argument [1] - remove stray whitespace - use canonical wording for the HISTORY section
mdoc nitpicking for gsched.8
- remove stray argument [1]
- remove stray whitespace
- use canonical wording for the HISTORY section

PR:		docs/147119 [1]
Submitted by:	Alexander Best <alexbestms@wwu.de> [1]
MFC after:	1 week

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