docs: fix typos

[JohannesMessner]

fix minor typos in documentation

[github-actions]

Latency summary

Current PR yields:

• 🐎🐎🐎🐎 index QPS at 1490, delta to last 2 avg.: +20%
• 🐎🐎🐎🐎 query QPS at 29, delta to last 2 avg.: +23%
• 🐎🐎🐎🐎 dam extend QPS at 44665, delta to last 2 avg.: +20%
• 🐎🐎🐎🐎 avg flow time within 1.3528 seconds, delta to last 2 avg.: +1%
• 🐢🐢 import jina within 0.3597 seconds, delta to last 2 avg.: -14%

Breakdown

Version	Index QPS	Query QPS	DAM Extend QPS	Avg Flow Time (s)	Import Time (s)
current	1490	29	44665	1.3528	0.3597
2.6.4	1304	26	40681	1.1141	0.4059
2.6.3	1165	20	33219	1.5487	0.4392

Backed by latency-tracking. Further commits will update this comment.