mhchem in TL2021 slightly changed

[Kornel Benko]

therefore is our examples/Modules/Hazard_and_Precautionary_Statements.lyx
not compilable.

1.) Statement 210 no variants
2.) 280 has 4 variants and does not allow extra text.

According to doc (Statement : Message)
--------------------------------------
P210 (P210): Keep away from heat, hot surfaces, sparks, open flames and other ignition
sources. No smoking. P280.0 (P280): Wear protective gloves/protective clothing/eye
protection/face protection. P280.1 (P280): Wear protective gloves. 
P280.2 (P280): Wear protective clothing. 
P280.3 (P280): Wear eye protection.
P280.4 (P280): Wear face protection.

	Kornel
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