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Phylloscopus maculipennis
Habitat
Temperate forests and subtropical or tropical moist lowland forests
Range
The Himalayas, Yunnan, north-east India and northern Indochina
The ashy-throated warbler is a leaf warbler found in the Himalayas, Yunnan, north-east India and northern Indochina. Its natural habitats are temperate forests and subtropical or tropical moist lowland forests (Wikipedia, general species account).
That short account is the only source read for the Bhutan guide. It gives no plumage, size, diet or breeding information, and does not name Bhutan, so none is stated.