update doc about vulkan-sdk

[nihui]

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docs/faq.en.md:46

• The phrase 'the dir ncnnConfig.cmake exist' should be 'the directory where ncnnConfig.cmake exists'.

set(ncnn_DIR { the dir ncnnConfig.cmake exist})

docs/faq.en.md:48

• The placeholder 'xxx.lib' is not very descriptive. It should be replaced with a more specific placeholder or explanation.

## xxx.lib not found（be specified by system/compiler）

docs/faq.en.md:53

• The phrase 'need vulkan-1.lib' should be 'needs vulkan-1.lib'.

need vulkan-1.lib

docs/faq.en.md:55

• The phrase 'need glslang.lib OGLCompiler.lib SPIRV.lib OSDependent.lib' should be 'needs glslang.lib, OGLCompiler.lib, SPIRV.lib, and OSDependent.lib'.

need glslang.lib OGLCompiler.lib SPIRV.lib OSDependent.lib

docs/faq.md:56

• [nitpick] The term 'glslang-default-resource-limits.lib' might be unclear to some users. Consider providing a brief explanation or context for this library.

需要 glslang.lib glslang-default-resource-limits.lib