docs(man): review text of the '$CemaNeigeLayers' element in the 'value' section of 'RunModel_CemaNeige*'

Refs #111, #123, aad9d1db, dd7ef429

Refs #85

v1.6.9.17 docs(man): add text and hyperlink in Runmodel_CemaNeige* and Runmodel_GR4H to inform users about the presence of hydrological model diagrams

Refs #80

v1.6.9.11 docs(man): replace the uses of UH1 and UH2 by UH in the help pages of RunModel_*GR5* functions
Refs #70

v1.6.8.41 docs(man): use the \doi mark instead of the \href mark to make links to article references of the help pages
Refs #80

Refs #79

Refs #66

v1.2.13.17 DOC: link to CreateRunOptions added RunModel_Cemaneige* doc in order to explain the IsHyst arg

v1.2.12.22 UPDATE: ErrorCrit* funs and many examples in doc now use Obs argument of CreateRunOptions instead obs or Qobs

v1.2.11.2 UPDATE: RunModel_CemaNeige* funs do not present anymore the IsHyst argument (now in CreatRunOptions and CreatCalibOptions) #5252

v1.0.5.2 RunModel_CemaNeigeGR5J() and RunModel_CemaNeigeGR6J() now also return temperature for each layer, as RunModel_CemaNeigeGR4J() (documentation updated) #4490

To be perfectly in CemaNeige functions examples, "BasinInfo$HypsoData [51]" is replaced by "median(BasinInfo$HypsoData)"