docs: update conda installation + minor fixes #11201

Job	Run time
Tests (ubuntu-latest / Python 3.9)	32m 3s
Doctests (ubuntu-latest / Python 3.11)	3m 20s
Tests (ubuntu-latest / Python 3.10)	31m 20s
Example scripts (ubuntu-latest / Python 3.12)	13m 45s
Example notebooks (ubuntu-latest / Python 3.12)	20m 30s
Tests (ubuntu-latest / Python 3.11)	28m 57s
Tests (ubuntu-latest / Python 3.12)	34m 31s
style	24s
Tests (macos-13 / Python 3.9)	30m 3s
Tests (macos-13 / Python 3.10)	26m 40s
Tests (macos-13 / Python 3.11)	20m 36s
Tests (macos-13 / Python 3.12)	26m 44s
Tests (macos-14 / Python 3.9)	15m 54s
Tests (macos-14 / Python 3.10)	13m 32s
Tests (macos-14 / Python 3.11)	11m 4s
Tests (macos-14 / Python 3.12)	9m 25s
Tests (windows-latest / Python 3.9)	32m 18s
Tests (windows-latest / Python 3.10)	34m 17s
Tests (windows-latest / Python 3.11)	30m 25s
Tests (windows-latest / Python 3.12)	29m 24s
	7h 25m 12s

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