docs: improve docs related to `mount-path` #67

Job	Run time
audit	9s
test-declare-inputs	34s
checks	11s
test-cache-storage (true)	33s
test-cache-storage (false)	26s
test-defaults	28s
test-formats (FAT, true)	23s
test-legacy-runners	11s
test-formats (FAT, false)	23s
test-large-size (Fixed, true)	46s
test-formats (FAT32, true)	23s
test-mount-path (true, ReFS)	31s
test-large-size (Fixed, false)	44s
test-formats (FAT32, false)	28s
test-mount-path (true, NTFS)	22s
test-large-size (Dynamic, true)	21s
test-paths-with-spaces (true)	21s
test-formats (exFAT, true)	22s
test-mount-path (false, ReFS)	25s
test-large-size (Dynamic, false)	19s
test-paths-with-spaces (false)	23s
test-formats (exFAT, false)	32s
test-mount-path (false, NTFS)	23s
test-formats (NTFS, true)	28s
test-unsupported-os	8s
test-formats (NTFS, false)	27s
test-workspace-copy-edge-cases (true, true)	23s
test-formats (ReFS, true)	26s
test-workspace-copy (true, true)	34s
test-workspace-copy-edge-cases (true, false)	23s
test-formats (ReFS, false)	28s
test-workspace-copy (false, true)	24s
test-workspace-copy-edge-cases (false, true)	24s
test-workspace-copy-edge-cases (false, false)	27s
test-cache-retrieval (true)	25s
test-cache-retrieval (false)	25s
	15m 0s

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