DOC: add a paragraph on spectral classification in the hyperspectral recipe.

24 jobs for !708 with spectral_angle_classif in 75 minutes and 33 seconds (queued for 1 second)
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Status Job ID Name Coverage
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fast-build

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legal-check

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  Prepare
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centos-xdk-prepare

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macos
macos-xdk-prepare

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ubuntu-xdk-prepare

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windows10
windows-10-prepare

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windows8
windows-8-prepare

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  Build
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centos-xdk-build

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debian-build

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macos
macos-xdk-build

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ubuntu-xdk-build-doc

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ubuntu-xdk-qa-code-coverage

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ubuntu-xdk-qa-static-analysis

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windows10
windows-10-build

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windows8
windows-8-build

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  Report
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ubuntu-xdk-report

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  External
passed cdash:centos-6.6-gcc

passed cdash:debian-testing-gcc

passed cdash:macos-10.11.6-clang

passed cdash:ubuntu-18.04-fast

passed cdash:ubuntu-18.04-llvm-qa

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passed cdash:windows-10-x64-vc14.0

passed cdash:windows-8.1-x86-vc14.0