Fix a few minor typos in the 5.1 release notes / changelog #95

Job	Run time
test-postgres-elasticsearch6 (3.8, Django>=3.2,<3.3)	10m 56s
test-postgres-elasticsearch7 (3.8, Django>=4.1,<4.2, false)	8m 1s
test-postgres (3.8, Django>=3.2,<3.3, false)	21m 9s
test-postgres (3.11, Django>=4.2,<4.3, postgres:12, notz, false)	17m 15s
test-postgres (3.10, Django>=4.1,<4.2, false, emailuser)	22m 27s
test-postgres (3.10, git+https://github.com/django/django.git@stable/4.2.x#egg=Django, true, post...	16m 18s
test-postgres (3.10, git+https://github.com/django/django.git@main#egg=Django, true, postgres:12,...	18m 16s
test-mysql (3.8, Django>=3.2,<3.3, false)	30m 59s
test-mysql (3.10, Django>=4.2,<4.3, false)	26m 6s
test-sqlite (3.9, Django>=4.1,<4.2)	11m 33s
test-sqlite-elasticsearch5 (3.8, Django>=3.2,<3.3)	7m 53s
test-sqlite-elasticsearch8 (3.10, Django>=4.2,<4.3, emailuser)	6m 40s
coverage	35s
	3h 18m 8s

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